SECTION KNEELING/LEVELING

Transcription

1 / 008JL9 ECTION KNEELING ECRIPTION This system is designed to lower the front of the vehicle for easier access to the first step. It can also tilt the vehicle to the right so that, for example, a wheelchair can roll on directly from the sidewalk. A safety system, consisting of an alarm and a flashing light, warns pedestrians on the sidewalk to move away from the vehicle at the start of the kneeling system operation. The alarm sounds and the light flashes while the vehicle is lowering. In addition, the hazard lights flash continuously during the lowering and rising operations. KNEEL MOE The system is designed so that the leveling valve is locked when kneeling is required. The kneeling solenoids control the pressure via the relay valve, causing prompt kneeling as requested. This process is executed via multiplexing. RIE MOE The minimal pressure maintained in the bellows will contribute to a faster return of the vehicle to normal. The rising of the vehicle is controlled by the fast rising valve. This valve controls the output of the high flow relay valve. The time that it takes for the vehicle to rise is governed by the multiplex system. OPERATION ee Figure for typical switch positions on the kneeling switch panel. ee the OPERATOR MANUAL for the locations of the switches on the vehicle. Three switches control the kneeling system. When the KNEELING AN RAMP MATER WITCH is in the ON position, the FRONT and the IE KNEELING WITCHE are operational. The brake interlock remains engaged during the time in which the vehicle is lowered or tilted. This condition continues until the KNEELING AN RAMP MATER WITCH is returned to its normal position. This occurs when the bus is returned to its normal right height, the ramp has been retracted and once the operator has pressed the brake pedal or the accelerator. The TOP indicator lights up when the brakes are applied. Once the KNEELING AN RAMP MATER WITCH is returned to the TOP position, the brakes are released and can be used again by the operator. ee Figures to 5. KNEELING AN RAMP MATER WITCH RIE MOE FRONT KNEELING WITCH IE KNEELING WITCH KNEEL MOE Figure - Typical Kneeling witches Front Panel

2 008JL9 / REAR PRING RIGHT IE RIGHT IE LEVELING C IN C EX BARKALE ACCEORY TANK FRONT LEVELING BARKALE REAR AIR PRING LEFT IE LEFT IE LEVELING C IN C EX BARKALE P < UP PILOT UP 3 OWN P < PILOT OWN 3 LOCK LEVELING LEFT RIGHT FRONT PRING Figure - Layout for Front Kneeling ystem Only RETARER BULKHEA AN LINE (OPTIONAL) LEVELING FRONT LEVELING UPPLY FROM EMERGENCY REERVOIR E ACCEORY REERVOIR LEVELING UB- AEMBLIE Figure 3 - chematic for Front Kneeling ystem Only

3 / 3 008JL9 C C BARKALE REAR AIR PRING LEFT IE LEFT IE LEVELING IN EX ACCEORY TANK LOCK LEVELING RIGHT IE LEVELING C IN C EX BARKALE FRONT LEVELING C IN C EX BARKALE 3 PILOT OWN 3 PILOT UP 3 PILOT OWN LOCK LEVELING OWN P < < P UP P < OWN REAR AIR PRING RIGHT IE < P UP 3 PILOT UP LOCK IE KNEELING LEFT RIGHT FRONT AIR PRING Figure 4 - Layout for Front and ide Kneeling ystem RETARER BULKHEA (OPTIONAL) FRONT LEVELING UPPLY FROM EMERGENCY REERVOIR ACCEORY REERVOIR IE-KNEELING UB-AEMBLIE UB- AEMBLIE Figure 5 - chematic for Front and ide Kneeling ystem

4 008JL9 4 / AJUTMENT CAUTION: Always adjust leveling before proceeding with kneeling adjustments. WARNING: Before lowering or tilting the vehicle, make sure that all passengers are secure inside the vehicle and that people outside the vehicle move away from the doors to prevent any risk of injury. Moreover, do not lower or tilt the vehicle onto the sidewalk or into a snow bank, etc.. Bring the vehicle to a full stop using the service brakes.. To lower the front of the vehicle, first raise the switch guard protecting the KNEELING AN RAMP MATER WITCH and put the switch in the ON position. This will automatically engage the brake interlock and avoid any accidental activation of the system. FRONT KNEELING 3. After steps and, move the FRONT KNEELING WITCH to the KNEEL position until the vehicle has lowered to the required height. IE KNEELING (optional) 4. After step 3: a) The side kneeling is controlled by the IE KNEELING toggle switch and is operational only if the KNEELING AN RAMP MATER WITCH is in the ON position. b) Put the IE KNEELING WITCH into the KNEEL position until the vehicle has reached its lowest preprogrammed level. This will take several seconds to complete correctly. YTEM VERIFICATION Always execute the front kneeling verification BEFORE the side kneeling verification, if applicable. Never try to execute both at the same time. Pressure in the system must be a minimum of 0 psi (87 kpa) and a 5-second delay between each rise must be maintained. Make sure the doors are continuously supplied with air. WARNING: For maximum security, follow these preventive security measures:. All tests must be carried out when no passengers are aboard.. Make sure that the vehicle is completely stopped on a level surface. 3. The installation of batteries or the connection of electrical terminals to an external power supply is required, if the engine is non-functional. 4. Before the inspection, make sure that objects that are in the way, such as safety supports, are removed.. Place the MATER CONTROL WITCH (on the operator's control panel) in the RUN position and start the engine.. Put the KNEELING AN RAMP MATER WITCH in the ON position. Make sure the ramp is retracted and the doors are closed (telescopic ramp only). For a flip ramp, doors must be open.

5 / 5 008JL9 COMMAN OR CONITION EQUENCE OF A REQUET FOR FRONT KNEELING ONLY ACTIVE OLENOI OF THE KNEELING YTEM COMMENT Vehicle in normal running mode None The air pushed by the leveling valve to adjust the level of the vehicle mainly passes through the manifold. Front kneeling command (operator) Reaching the low level (0- psi in the bellows) Lock solenoid rain solenoid Lock solenoid These two valves are active throughout the descent cycle. Reaching the predetermined time limit results in the stopping of the drain solenoid to stop the lowering process. Command for rising (operator) Fast solenoid Only the fast solenoid remains active during the rising. everal seconds after command to raise everal seconds after command to raise Fast solenoid None Table - equence of a Request for Front Kneeling Only After several seconds (time monitored by the electronic module). After several seconds, the sequence is complete. FRONT KNEELING ee Table. 3. Following steps and, set the FRONT KNEELING WITCH to the KNEEL position until the vehicle starts to lower. Three valves should now be active: lock solenoid (A), drain solenoid (C) and the fast solenoid (). As soon as the pressure in the right air spring has reached the set point, descent is stopped and the vehicle remains at this level. Three valves must still be active at this point: lock solenoid (A), pressure lock (B) and the fast solenoid (). 4. The vehicle must kneel to the front. Make sure the following conditions are observed during the kneeling operation. a. The entire lowering sequence takes a maximum of six seconds. Use a stopwatch to verify. b. The alarm must function during lowering. The alarm stops when the lowering sequence is completed. c. The yellow exterior indicator lights are flashing. d. The kneeling LE in the tell-tale panel is illuminated and remains lit until a request to raise the vehicle is made. 5. Check under the vehicle to make sure the air springs are not completely deflated, are still holding some air and are still cylindrical in shape. 6. Put the FRONT KNEELING WITCH in the RAIE position. Use a stopwatch and check whether the entire rising sequence takes a maximum of six seconds. The cycle ends when the interlock is released. Only one valve remains active at that moment, the fast solenoid (), and this for a period of 0 seconds from the moment of the request for rising. However, three seconds after this request, the interlock valve of the brakes is deactivated to allow the vehicle to return to normal operation. 7. Repeat the complete kneeling sequence (KNEEL and RIE) a few times to make sure the system is operational and to confirm that the front doorsill level is at the required height, which should be 0 5 /8"± ½" (70 mm ± 3 mm). 8. If the tests are not satisfactory, check the pneumatic and electrical connections of the electronic module. If air pressure lowers, check the supply hose to see if there are leaks or check the system for electrical problems. 9. Repeat the same test with the MATER CONTROL WITCH in the LIGHT position. Then, repeat the test keeping the engine off. Make sure that the underbody does not rest on the axle; no contact is allowed. If the tests are still not satisfactory, see the TROUBLEHOOTING TABLE at the end of the section.

6 008JL9 6 / IE KNEELING (optional) 0. When the front kneeling verification is over, set the IE KNEELING WITCH at the KNEEL position. The vehicle should immediately start to go down. Three valves are now active at the front and three at the back in the base light: lock solenoid (A and E), drain solenoid (C and F) and fast solenoid ( and G). As soon as the pressure in the right air springs has reached its set point, the descent is stopped and the vehicle remains at this level. ix valves must still be active at this point: lock solenoids (A and E), pressure locks (B and H) and fast solenoids ( and G).. The vehicle must kneel to the side. Make sure the following conditions are observed during the kneeling operation. a. The entire lowering sequence takes a maximum of six seconds. Use a stopwatch to verify. b. The alarm must function during lowering. The alarm stops when the lowering sequence is completed. c. The yellow exterior indicator lights are flashing. d. The kneeling LE in the tell-tale panel is illuminated and remains lit until a request to raise the vehicle is made.. Check under the vehicle to see that the air springs are not completely deflated, are still holding some air and are still cylindrically shaped. Make sure that the underbody does not rest on the axle; no contact is allowed. 3. Put the IE KNEELING WITCH in the RIE position Use a stopwatch and check whether the entire rising sequence takes a maximum of six seconds. Only two valves are then active: the fast solenoids ( and G) and this for a period of 0 seconds from the moment of the request for rising. However, three seconds after this request, the interlock valve of the brakes is deactivated to allow the vehicle to go back on the road. 4. Repeat the complete kneeling sequence (KNEEL AN RIE) a few times to make sure the system is operational and to confirm that the doorsill level is at the required height. ee Table. RAMP TYPE TELECOPIC RAMP AT THE BACK EMI UPER HEIGHT AT THE REAR OOR THREHOL ½"±½" 38 mm ± 3 mm 9¼"±½" 35 mm ± 3 mm Table - Rear oorsill Height uring ide Kneeling 5. Repeat the same test with the MATER CONTROL WITCH in the LIGHT position. Then, repeat the test keeping the engine off. When tests are satisfactory, put the KNEELING AN RAMP MATER WITCH in the TOP position, and replace any removed panels and other components. However, if the tests are not satisfactory see the TROUBLEHOOTING TABLE at the end of this section. MAINTENANCE WARNING: To avoid accidents, empty the bellows and the pneumatic reservoirs before working on the kneeling system components. The kneeling mechanism does not require specific maintenance. A visual inspection of the lever, linkage and joints should be made at regular intervals. The front kneeling pneumatic control unit is located under the operator s floorboard close to the steering column. This assembly is fastened to the vehicle chassis. ee Figure 6. The assembly includes: Two 3-way solenoid valves Two -way solenoid valve Two A- valves One manifold OLENOI REMOVAL. Mark the hoses, disconnect and block them to prevent contamination. You can also check the pneumatic diagrams for the hose color codes.. Mark and disconnect the wires. Also, see the COACH WIRING IAGRAM. 3. Remove the screws holding the valve assembly in place. RECONITIONING A reconditioning kit is available. It contains an o-ring, gaskets, fittings and lubricant. It also includes reconditioning instructions, which should be followed to rebuild the valves. ee the PART MANUAL for the required part numbers.

7 / 7 008JL /4A FRONT 3. PILOT RELAY OWN. RELAY OWN 3. MANIFOL 4. RELAY LOCK (OPTIONAL) 4A. RELAY LOCK FRONT LEFT BELLOW 5. RELAY UP 6. PILOT RELAY UP 5 6 4A 3 FRONT AN IE Figure 6 - Front or ide Kneeling Pneumatic Control Unit

8 008JL9 8 / RELAY OWN PILOT RELAY OWN RELAY UP RELAY LOCK PILOT RELAY UP Figure 7 - Pneumatic Control Valve for ide Kneeling INTALLATION. Reconnect the hoses and wiring using the markings made during removal, if applicable.. Attach the valves to the plate with fastening screws. PILOT AN RELAY REMOVAL. Mark the hoses, disconnect and block them to prevent contamination. You can also check the pneumatic diagrams for the hose color codes.. Remove the screws holding the valve assembly in place. RECONITIONING A reconditioning kit is available. It contains an o-ring, gaskets, fittings and lubricant. It also includes reconditioning instructions, which should be followed to rebuild the valves. ee the PART MANUAL for the required part numbers. LEVELING ECRIPTION ee Figures 8 and 9. Figure 8 shows one side of the rear leveling system installation. The leveling system is designed to maintain constant height of the vehicle regardless of the load. It also increases roll stability of the vehicle. The system is composed of air-leveling valves (height adjustment valves). Two valves are installed on the rear axle in the wheel housing and one valve is installed at the front, at the centerline of the vehicle, between the two center radius rods. The front valve is linked to the chassis by means of the radius rod support. The front leveling valve is protected by a dust pan. INTALLATION. Reconnect the hoses using the markings made during removal, if applicable.. Attach the valve with the fastening screws.

9 / 9 008JL9 OPERATION When the frame moves up or down, the bellows are pressurized by the accessories reservoir, or vented to produce pressure equilibrium between them. This action is regulated by the leveling valves. The valves regulate the gap between the vehicle axle and the frame. Each valve link triggers the valve lever allowing a change of frame height in relation to the axle. As the vehicle load increases, the chassis, linked to the axle, moves down. This movement causes a deviation of the leveling valve lever from its neutral position. The deviation causes the rotor disc to turn, allowing air to pass through the filling control post. Air is now pushed toward the bellows to increase the pressure and, therefore, to raise the chassis back to the neutral position. As the load of the vehicle decreases, the air pressure in the bellows raises the chassis. This movement causes a deviation of the leveling valve lever from its neutral position. The deviation causes the rotor disc to turn, allowing air passage through the exhausting control post. Air is now purged out of the bellows to decrease the pressure and thus lower the chassis back to the valve s neutral position. The valve features a level control and a reference adjustment position. The reference adjustment allows the rising of the vehicle frame at a constant rate, together with an increase in the angle of the access ramp of the vehicle. The maximum operating range of the leveling valve is 75 from the horizontal position of the lever. At maximum operating pressure, the rate of leakage cannot be greater than 0.6 cm 3 /min. CONTROL LEVER INTALLATION The rear levers are connected to the axle of the vehicle with longitudinal adjustable links. The control levers must be installed to point in the direction of the mark on the axle shaft. Each control lever is bolted to the valve at a torque of 5 lb-ft (0 N m). The bellows are charged when the levers are moved upwards and vented when the levers are moved downwards. The leveling valve is assembled so that the lever is in a horizontal position and the orifice inside the dust shield points downwards. The linkage is bolted to the radius rod support at a torque value of 04 ± lb-in (3 ± N m). AJUTMENT REFERENCE AJUTMENT The reference adjustment permits the raising of the chassis up to a certain height. Pressure is raised at the control port with the help of a solenoid valve. This port is supplied with compressed air from the valve. This action forces the disc to rotate. As a result, the inlet opens and air circulates to the bellows. This has the effect of raising the chassis until the lever reaches the new reference position.. LEVELING. TELECOPIC LINKAGE 3. AXLE ATTACHMENT ARM 4. LIING PIN 4 3 Figure 8 - Rear Leveling ystem Figure 9 - Front Leveling ystem

10 008JL9 0 / LEVELING AJUTMENT CAUTION: Before proceeding with any adjustment, ensure that security stands are under the vehicle. Pressure in the system must be a minimum of 0 psi (87 kpa). REAR LEVELING. Loosen the clamp around each P-mount. ee Figure 0.. From the right side of the vehicle, measure the distance between the underside of the mounting plate under the air spring and the underside of the structure to which it is attached. ee Figure. This distance should be 9 ½ in. ±¼ in. (3 mm ± 6 mm). 3. To adjust the height of the vehicle, carefully loosen the P-mount upward to decrease the distance between the air spring mounting plates or downward to increase it. 4. Let the pneumatic system stabilize and measure the distance between the mounting plates again. 5. Repeat steps to 4 on the left side of the vehicle. 6. Tighten the clamp carefully, so as not to damage the P-mount. 7. Recheck the rear leveling of the vehicle and make any necessary adjustments. Once the adjustments have been completed, ensure that the end of the adjustment arm is level with or surpasses the hole on the P-mount. ee Figure. MEAURE BETWEEN MOUNTING PLATE AN TRUCTURE Figure 0 - upport en P P-MOUNT CLAMP AJUTEMENT ARM Ensure that the leveling arms are horizontal, ±3, and that the P-mount on top of the linkage is oriented toward the valve. This position is critical, in order to restrict the movement of the leveling valve. Figure - Mesuring The Front Leveling FRONT LEVELING 8. Attach a torpedo level on the front doorsill, over the reference points on the ground. ee Figure Loosen the adjustments bolts on the front leveling valve. ee Figure While looking in the direction of the front doorsill, and with the arm of the valve pointing towards the back, loosen the bolts at the front leveling valve and turn the valve counter-clockwise to deflate the air springs until a height of 4 ⅝ in. ±¼ in. (37 mm ±6 mm) is reached at the doorsill. Leave the vehicle time to stabilize. At this stage, the needle point is touching the floor and the cord is slack. ee Figure 5.. Turn the valve clockwise until the cord is tight and the needle point barely touches the reference surface. Leave the vehicle time to stabilize. THE AJUTMENT ARM MUT BE LEVEL WITH OR URPA THE HOLE ON THE P-MOUNT Figure - Installation of P-Mount Adjustment Arm

11 / 008JL9. Validate the reference distance and tighten the bolts. 3. It might be necessary to readjust the rear leveling after the front leveling adjustment is complete. REFERENCE POINT TORPEO LEVEL ELF MAINTENANCE The leveling valves require no specific maintenance. However, a visual inspection of the lever, linkage and joints should be performed regularly. In case of a continuous leak at the air exhaust port, it is recommended to replace the damaged components or to install a new part. At maximum operating pressure, the leakage rate should not be greater than 6 cm 3 /min. Figure 3 - Torpedo Level and Reference Point FRONT LEVELING REPLACEMENT CAUTION: In order to avoid injuries, before beginning the procedure, safely support the chassis by placing blocks under the vehicle at the lifting points. Release the air from the system, by opening the drain valves of the suspension air reservoir. AJUTMENT BOLT CAUTION: An anti-return valve is installed at the reservoir for each circuit at the front and rear of the vehicle. REMOVAL Figure 4 - Adjustment Bolts. Remove the screws and washers on the dust pan to gain access to the valve.. isconnect all air hoses. Protect ends of tubes and fittings against contamination. 3. Remove the bolts, washers and nuts that attach the valve to the bracket. 4. Remove the valve by separating the two sliding arm extremities. INTALLATION. lide the female extremity of the sliding arm, attached to the valve, over the male extremity. CAUTION: o not apply lubricant on or inside the sliding arm.. Attach the valve to the bracket by installing bolts, washers and nuts. Figure 5 - Torpedo Levelr

12 008JL9 / Connect all air hoses. Check for, and remove, any contamination, if the ends of tubes and fittings had not been so protected. 4. Attach the dust pan over the valve installation by replacing the washers and screws. REAR LEVELING REPLACEMENT CAUTION: In order to avoid injuries, before beginning the procedure, safely support the chassis by placing blocks under the vehicle at the lifting points. Release the air from the system, by opening the drain valves of the suspension air reservoir. REMOVAL. isconnect the air hoses and the valve bellows lines. Make sure the ends of tubes and fittings are protected against contamination.. isconnect the leveling valve adjustment arm from the extension arm. 3. Remove the nut, washer and bolt securing the leveling valve lever to the P-mount. 4. Remove the bolts, washers and nuts that secure the leveling valve to its support. Remove the valve assembly. INTALLATION. Attach the valve to its support by installing bolts, washers and nuts.. Connect the air hoses and the valve bellows lines. Check for, and remove, any contamination, if the ends of tubes and fittings had not been so protected. 3. Attach the leveling valve lever to the P-mount with a nut, washer, and bolt. 4. Attach the leveling valve adjustment arm to the extension arm. 3. ubmerge the valve in a water container and check for air bubbles when the control lever is in a central position. There should be no air leak from any part of the valve. 4. If bubbles escape from the bellows ports, this is an indication that the air intake valve is defective and must be replaced. 5. Release the air pressure in the ducts from the inlet fitting and connect to the bellows port. If air bubbles escape from the check valve inlet port, this is an indication that the check valve is defective and must be replaced. 6. If bubbles escape from the air exhaust, this is an indication that the air exhaust valve is defective and must be replaced. 7. If bubbles appear at the edge of the valve cover, the cover seal must be replaced. 8. If no leak is detected, take the valve out of the water, then with the air pressure line still connected at the bellows port, activate the control lever to eject the remaining water that might have penetrated into the exhaust chamber of the valve. isconnect the air lines, connect them to the inlet and repeat the procedure to remove the water from the air intake valve chamber. ENGINE AN TRANMIION It is very important to follow the prescribed procedures for the proper leveling height, not only for the comfort of the passengers, but also to ensure a long service life for vehicle components. Technicians must respect the level heights mentioned herein, in order to avoid premature deterioration of joints, and to avoid excessive vibration of the drive shaft. The drive shaft manufacturer recommends a tolerance angle of <3º horizontal between its axis and the attached components. ee Figure 6. If the leveling height procedure is followed properly, then this tolerance can be respected. CHECKING LEVELING FOR LEAK Air leakage checks can be performed when the valve is installed on the vehicle and air system pressure is applied to the valve. The following instructions explain the procedure for air leakage checks while removing the valve from the vehicle.. Clean the outside of the valve.. Connect the air pressure line to the inlet port and apply air pressure of 0 psi (87 kpa).

13 / 3 008JL9 TECHNICAL PECIFICATION THREE-WAY OLENOI - PARKER olenoid...three way/normally open Maximum pressure...80 psi (4 kpa) Voltage... 4-VC Part Number... ee PART MANUAL TWO-WAY OLENOI - WAINBEE olenoid... Two-way/Normally closed Maximum pressure...80 psi (4 kpa) Voltage... 4-VC Part Number... ee PART MANUAL PILOT Type...Two-way/Normally open Maximum pressure...50 psi (73 kpa) Working pressure... to : closes at 4 psi (90 kpa)... to : opens at 70 psi (483 kpa) Part Number... ee PART MANUAL FRONT AN REAR/LEVELING - BARKALE Operating Pressure... 0 psi (87 kpa) Temperature range F to 49 F...(-37 C to 65 C) Part Number... ee PART MANUAL <3 <3 Figure 6 - Important - <3 angle

14 008JL9 4 / TROUBLEHOOTING GUIE PROBLEM CAUE OLUTION. The vehicle does not kneel when requested:. The vehicle goes down but does not remain at its kneeling position: 3. The vehicle goes down too low and reaches the axle stops and the bellows are completely deflated: 4. Ride height cannot be constantly maintained. The drain solenoid does not activate. a) The lock solenoid does not activate. b) The pneumatic hoses might have been reversed on the valve. a) Leak in valve(s) b) Leak in hoses 5. No air to the valve. a) Air system not working correctly. b) Blocked air supply lines 6. Exhausting of air after switch returned to neutral position 7. Excessive air consumption a) Contaminants in the air system b) Incorrect plumbing c) Internal problem with leveling valve a) Air leakage b) Worn shock absorbers c) Incorrect valve installation 8. Rough ride a) Incorrect ride height b)worn shock absorbers c) Valve will not exhaust d) Valve will not deliver air 9. Bottoming out a) Incorrect chassis height b) Worn shock absorbers a) Check the electrical connections and the multiplex module fuses. b) The harness might be connected incorrectly. c) Ensure that the solenoid valve is clean. a) Check the electrical connections and fuses. b) Check the pneumatic hoses and replace, if necessary. c) Check the two-way solenoid valve. a) Check all solenoid valves. a) Verify the valve(s) for leaks and replace, if necessary. b) Verify hoses for leaks. If no leaks found, ensure end connections are tight. a) Inspect air lines for leaks or pinched hoses. b) Verify system pressure by removing the supply line at the valve. a) Inspect the air supply system for oil, moisture or foreign materials. If contamination is suspected, evacuate and clean the system. b) Inspect installation of the inlet and output ports. Reassemble if necessary. c) Replace valve. a) Check all air lines and connections for leaks. Make necessary repairs. b) Check shocks for fluid leaks. Replace as necessary. c) Adjust the linkage. Check for proper valve installation and orientation of plumbing to the air supply. a) Check the height at the correct measuring points Adjust linkage as necessary. b) Check shocks for fluid leaks. Replace as necessary. c) Check for pinched air line or incorrect installation. Make necessary repairs. d) Check for pinched air supply and/or delivery lines. Verify system pressure at the valve. Check for correct valve installation. a) Check the ride height at the correct measuring points. Adjust the leveling valve linkage as necessary. b) Check shocks for fluid leaks. Replace as necessary. 0. Vibration Incorrect drive line angles Adjust the linkage according to specifications. Table 3 - Troubleshooting Guide