Service & Operation Manual H619 Pulled Scraper
Forward Humdinger Equipment LTD. is committed to your satisfaction with our products and services. Please review this manual and learn your product. This machine is the culmination of many years of experience in the scraper business and was designed using the state of the art computer aided design equipment. This combination of resources results in a superior product. We want you productive and satisfied. If you have questions about your machine we encourage you to contact us at 806-771-9944. We can also be located on the web at Humdingerequipment.com. As our products evolve and improve, you can find the latest information on our website. Thank You
Operation Section Daily Walk Around Inspection For maximum service life, performance, and safety each machine should be inspected daily before operation. Perform a general walk around looking for missing or loose bolts, hydraulic leaks, structural damage or cracks, and build up of trash or material on the machine. Repairs should be made before continued operation of the machine. In addition these specific areas should be checked: 1) Tires should be checked for damage and proper inflation. The proper cold inflation pressure is 76 psi for 34 ply tires and 62 psi for 28 ply tires. If tires are checked when they are not cold do not lower the pressure if it is above the recommended pressure. Only lower the pressure if the tire is cold. If it is below the recommended pressure and the tire is warm bring the pressure up to the cold inflation pressure and then check it the next time the tire is cold. It is preferable that the tires be inflated only with Nitrogen. Air can be used if Nitrogen is not available. 2) Check the draft frame for cracks or distortion.
3) Check the draft frame bolts for tightness. If loose, torque to 320 Ft-Lbs 8) Check the Apron Arm Bolts for proper tightness. Proper torque is 320 Ft-Lbs. Grease daily. 9) Inspect the bowl, apron, and ejector for cracks or damage and make any necessary repairs. 10) Grease the Bowl and Apron Lift Cylinders daily (Top & Bottom) 4) Tire nuts and studs. Wheel nuts should be torqued to 320 Ft-Lbs 5) Check hydraulic lines and hoses for missing or loose clamps and damaged or worn hoses. Replace or repair as necessary. 6) Check both hitches for cracks, damage or unusual wear. Repair as necessary. 7) Check apron ball retention bolts for tightness. Proper torque is 320 Ft-Lbs 11) Check that all pin joints fasteners are in place and are tight.
12) Check cutting edges, router bits and tips for wear damage or missing bolts. Make repairs as necessary. 14) Check lines for wear and replace as necessary. 13) Check Lower and Upper Ejector Rollers for Adjustment and Proper Operation
Operating Techniques Loading 1) While approaching cut, make sure that the ejector is fully returned to the rear of the bowl and that the apron is at the desired opening. If pulling units in tandem both machines should be in this mode. Proper opening of the apron depends on operator preference and the material being loaded. In general, the operator will develop sighting off the apron to determine the opening needed. 2) While approaching cut reduce travel speed and downshift the tractor to the proper gear for the material being loaded. For reference most materials will load properly around 5 mph. 3) Lower the bowl to start the cut. The cut should be shallow enough to allow the tractor speed to remain constant while reducing tire slippage. To reduce tire slippage raise the bowl incrementally until the tire slippage becomes minimal. Bowl depth can be determined by marking of the depth gage shafts. 4) Downshift if more torque is required in the cut. 5) Pull the scrapers in as straight a line as possible. Large radius cuts are permitted but turning with the bowl in the ground may cause structural damage. 6) Do not overload the bowl. In general more material will be moved as soon as the bowl is loaded to the rated capacity. Attempting to load addition material in the bowl is inefficient, requires additional fuel, and increases tire wear. 7) When the bowl is full, lower the apron and raise the bowl to carrying height. 8) If loading the second bowl repeat the operation. The second bowl is loaded by sighting off the front ejector to get the apron height correct. Bowl depth is measured by feel through tractor lugging and tire slippage and looking at the depth gage shafts. 9) If pulling in tandem, load the front bowl first. Optional Loading Technique: Enter the cut with both bowls lowered close to the ground. Lower and load the front bowl. When the front bowl is full, raise it. Raising the front bowl will lower the rear bowl. If done properly the rear bowl will be lowered to approximately the correct digging depth. Modulate the depth as required. This technique allows for momentum to be maintained and for a smooth cut area. Traveling 1) Raise the bowl high enough to avoid obstructions. 2) Travel at speed commensurate with the haul road conditions and traffic on the jobsite. Excessive
speed with poor haul roads will cause reduced life of the machine. Consult with local regulations regarding the applicability of brakes. 3) Reduce speed when making turns. 4) Unless other rules apply on the jobsite, unloaded machines should yield to loaded machines. 5) Traveling on side slopes requires caution. Never turn uphill on the side slope. If the machines start to slide, turn downhill. 6) Hauls roads should be maintained properly with graders and water trucks used to prevent excessive dust that causes lower visibility. Dumping and Spreading 1) When approaching the fill, maintain the proper engine rpm. 2) Lower the bowl(s) the desired fill strike off height. 3) Maintain speed to prevent material build up in front of the machine. 4) Both scrapers can be dumped at the same time if desired. 5) Open the apron and the ejector will come forward ejecting the material. 6) After finishing the dump raise the bowls and return the ejector and reset the apron to the proper position for the next load. Top Loading Scrapers This procedure must be followed to top load scrapers or damage will occur to structures and cylinders. 1) Lower the bowl(s) completely to the ground. 2) Do not raise the rear wheels off the ground during the lowering operation 3) The tractor must be braked or in park during loaded. 4) Because the weight of excavator loaded material is higher per cubic yard than that loaded by a scraper, the fully loaded bowl should be reduced by 2 yards. The rated bowl capacity of the H169 is 45600 Lbs. Parking the Machine 1) Park on a level surface and set the parking brake. 2) Lower the bowl to the ground. Apply a slight downward pressure. Machine Adjustments 1) Any adjustments to the bowl require the bowl to be blocked up. The blocks should be suitable to carry the weight of the bowl. 2) Always set the parking brake and properly chock the machine to prevent movement.
3) When working on the apron the apron should be blocked up or chained up. Below are acceptable methods of blocking the bowl up and restraining the apron. The apron should be raised and chained tightly through the front apron view port and the lift lugs on both sides of the bowl. cool down for each hour or roading. 3) Obtain all applicable permits and observe all laws and regulations. Roading Scrapers 1) Make sure the tires are at their recommend tire pressures. 2) After exceeding one hour of roading stop 30 minutes to allow tires to cool down. Repeat the
Maintenance Section Torque Specifications Warning: All fasteners on the H619 are grade 8. When replacing fasteners use grade 8 or better. Humdinger Equipments parts should be used to protect your investment. Torque Ft Location Lbs Brake Caliper Bolts 320 Brake Disc Bolts 177 Tail Roller Nut 175 Router Bit Bolts 400 Cutting Edge Bolts 400 Teeth Bolts 400 Hitch Retention Plate Bolts 320 Trailing Unit Hitch Bolts 320 Lift Pin Bolts 320 Draft Frame Arm Bolts 320 Apron Arm Bolts 320 Apron Pivot Shaft Bolts 160 Axle Retention Bolts 320 Wheel Studs Nuts 320 Covers Bolts 35 Regen Valve Bolts 35 Sequence Valve Bolts 35 Axle Cover Bolt 18 Axle Seal Retainer Bolts 18 Hitch Ball Bolts 320 Ejector Roller Cap Bolts 37 Ejector Roller Retainer Bolts 59 General Torque Specifications Torque Ft Size Lbs 5/16-18 18 3/8-16 35 7/16-14 52 1/2-13 78 5/8-11 160 3/4-10 273 7/8-9 469 1-8 670 1 1/8-7 962 Tire Inflation Tires shipped from the factory are inflated with dry nitrogen. This is to prevent the possibility of combustion within the tire, slows the deterioration of the rubber compounds within the tire, and reduces the corrosion of rim components. Recommended cold tire inflation pressure for factory supplied tires is 76 psi for 34 ply tires and 63 psi for 28 ply tires. Consult with your tire supplier for additional information. Warning: To avoid over inflation, the proper use of nitrogen inflation equipment and training in the use of that equipment is necessary. Improper or misused equipment can cause a tire
blowout or rim failure. Serious personal injury or death can occur due to tire blowout or rim failure Because a fully charged nitrogen cylinder s pressure is approximately 2200 psi, a tire blowout and or rim failure can occur if the inflation equipment is not used correctly. Lubricants Use the hydraulic fluid recommended by your tractor supplier. Maintenance Schedule When Required Replace Cutting Edges and Router Bits Replace Draft Frame Wear Pads Adjust Ejector Carrier Rollers Daily Walk Around Inspection Lubricate Hitch Check adjust Ejector Guide Rollers Grease Lift Cylinder Pins Check Brake Lines Every 50 Hours or Monthly Check Hitch Ball and Retainer for wear. Remove shims as necessary. If wear is substantial replace the hitch retainer plate and/or ball. Check Brake Pads and Disc for wear and replace as necessary. The minimum disc thickness is.500 inches. Minimum lining thickness is.0625 inches. Check brake caliper bolts for proper torque. Every 2000 Hours or Yearly Inspect and repack Ejector Tail Rollers. Hydraulic Systems Oil Change. Wheel Bearing Repack. Warning! The Ejector Rollers and Rear Wheel Assemblies have grease fittings. These are to be used only at the time the bearings are re-packed. Do not grease these items daily. Check Tire Inflation Every 250 Hours or Monthly Wheel Bearing Check
Hookup Information 3 rd Bowl Down 3 rd Apron Up 3 rd Ejector Forward 3 rd Apron Down 3 rd Ejector Return 3 rd Bowl Up 2 nd Bowl Down 2 nd Apron Up 2 nd Ejector Forward 2 nd Bowl Up 2 nd Apron Down 2 nd Ejector Return Unused ports must be capped.
3rd Bowl Row 1 st Bowl Row 2 nd Bowl Row Row Functions (Left To Right) Bowl Up Apron Down/Ejector Return Apron Up/Ejector Forward Bowl Down Unused ports must be capped. If air is in the system then the hydraulics must be cycled several times to remove it from the system. Warning: Many of the circuits have trapped high pressure oil in them so before removing hoses or tubes relieve the hydraulics at the tractor and carefully bleed the hydraulics at the fittings before removing the affected hydraulic line.
Brakes The Humdinger H619 uses ISO 5676 Hydraulic Couplings for connecting the braked machine to the tractor. Before connecting make sure the proper couplers are in place. These couplers are specifically designed to limit fluid loss and air entry into the system. valve. Use a hose for bleeding to avoid getting fluid on the linings. 5) Repeat for the other calipers 6) All four calipers must be bled. 7) Test for proper function. Before connecting the lines make sure all couplers are clean and free of foreign material. After coupling the machines for the first time the brakes must be bled. It is not necessary to remove the tire and rim to bleed the brakes. Bleeding Procedure 1) Park the tractor and scrapers on level ground. 2) Make sure the tractor is in park and set parking brake if equipped. 3) Properly chock the scrapers and lower all cutting edges to the ground to prevent movement. 4) Open the bleed valve on one of the caliper disc and have someone in the tractor press the brake pedal. Keep valve open and the pedal pressed until the fluid is clear and free from air. While the fluid is flowing from the caliper close the Bleed Port Tire and Rim Removed for Clarity
WARNING DO NOT OPERATE THE BRAKE SYSTEM AT MORE THAN 2300 PSI. OVER PRESSURIZATION OF BRAKE MAY RESULT IN SEAL DAMAGE CAUSING LOSS OF BRAKING AND POSSIBLE CATASTROPHIC FAILURE. MAINTENANCE 1) Inspect brake periodically to insure that all boots are tight and that there are no leaks. Inspect for boot deterioration and excessive lining wear. 2) Lining should be replaced when the friction material is worn to 1/16 inch thickness. 3) Inspect disk used with the brake head assembly for damage and wear. Replace the disk if it has worn to.500 inch or less. 4) Brake lining hold pins should be adjusted to have a clearance of 0.060 inch to 0.125 inch. WARNING FAILURE TO REPLACE LINING OR DISK WHEN WORN TO LIMITS WILL RESULT IN LOSS OF BRAKING AND POSSIBLE CASTASTROPHIC FAILURE. NEW PAD BREAK IN When new or relined brakes are installed on a machine the brake linings should be burnished in accordance with the following procedure to achieve maximum braking performance: 1) Drive scraper at 5 to 20 mph with brake applied at just enough pressure to produce a noticeable drag. Heavy smoke and foul odor from the brake lining is normal during this procedure. 2) Continue cycle until disk achieves a temperature of 600 deg F to 700 deg F. A surface pyrometer applied to disk after
stopping will determine temperature. 3) Permit disk to cool to less than 200 deg F. 4) Repeat steps 1 and 2 until full braking performance is achieved.
Hitch Retention & Shimming 1) The Hitch ball (Item 2) should be connected to the hitch and shimmed if needed to give approximately.040 inch of vertical clearance. The hitch retaining ring (Item 1) should them be torqued to 320 Ft-Lbs. 2) Attach the scraper draft frame to shaft of the hitch ball and insert the cylindrical lock (Item 10), install the cap (Item 4) and bolts and torque to 320 Ft