This 664-page New Holland Construction RG80, RG100 Service Manual (OEM #75131050) breaks down every system on your Road Grader, from the diesel engine and torque converter transmission to the hydraulics that run the moldboard. You get full wiring schematics for the cranking, charging, and warning light circuits, hydraulic schematics covering the pump and control valve, and page after page of exploded views for the front axle, tandem drives, and moldboard assembly. Troubleshooting charts walk you through starter and alternator faults step by step, and a dedicated torque section keeps every bolt where the factory wants it. Set starter cranking current between 325 and 375 amps, and confirm ground cable voltage drop stays under 0.2 volts before you chase a phantom no-start. No more swapping parts on a guess when your grader won't turn over. Bookmarked by section, so you can jump straight from the cover page to hydraulics without scrolling through 664 pages.
What's Inside This New Holland Construction RG80, RG100 Manual
| System | Pages | Key Topics |
|---|---|---|
| Engine | 12-193 | Description of Operation, Cylinder Head Assembly, Camshaft Assembly, Crankshaft Assembly, Connecting Rods, Pistons, Manifolds |
| Transmission | 194-255 | General, Torque Converter, Hydraulics, Control Valve Unit Solenoid Selection Code, Transmission Schematic, Electrical, Specifications, Special Tools |
| Front Axle | 256-299 | Adjustments, Front Axle Toe-In, Steering Cylinder, Front Wheel Bearings, Disassembly and Repair, LH Steering Knuckle and King Pin Removal, RH Steering Knuckle and King Pin Removal |
| Rear Axle and Tandems | 300-375 | General, Specifications (Rear Axle, Differential, Drive Shaft, Tandem Box), Troubleshooting, Rear Axle and Tandem Drive Assembly (Removal) |
| Electrical | 376-444 | General, Definitions of Electrical Terms, Starting and Charging, Specifications, Special Tools, Troubleshooting (Preliminary Troubleshooting, Chart) |
| Hydraulics | 445-556 | Hydraulic Schematic, General, Specifications, Special Tools, Troubleshooting, Pressure Settings (Main Relief Valve, Fan Motor), Adjustments (Control Lever Linkage) |
| Operator’s Platform and Controls | 557-629 | Section Index - Operator’s Platform |
| Moldboard and Implement | 630-664 | Special Tools, Disassembly and Repair, Drawbar, Drawbar Removal, Drawbar Installation, Circle, Circle Removal, Circle Installation |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Maximum acceptable voltage drop between starter solenoid and positive battery post or between ground stud and engine ground | 0.2 volts | p. 387 |
| Starting Motor Rating | 3.1 Kw (4.2 Horsepower) | p. 380 |
| Starting Motor Cranking Ratio | 12.8:1 (128T Flywheel; 10T Starter Pinion) | p. 380 |
| Jumper wires | Special Tool (no specific clearance, torque, or replacement values provided) | p. 382 |
| Maximum acceptable voltage drop for Battery Ground Cable | 0.2 volts | p. 392 |
| Control Valve Unit Socket Head Mounting Screws Torque | 20 Nm (14.7 lb-ft) | p. 209 |
| Controller Replacement | replace controller | p. 212 |
| Engine Cylinders | 4 | p. 4 |
| Engine Displacement | 5.0L (304 cu.in.) | p. 19 |
| Transmission Clutch Main Pressure | 16 – 18 bar (232 – 261 psi) @ 2000 rpm | p. 201 |
| RG80 | ||
| RG80 Rated Horsepower | 75.6 | p. 19 |
| RG100 | ||
| RG100 Rated Horsepower | 101 | p. 19 |
New Holland Construction RG80, RG100 Common Problems This Manual Covers
New Holland RG80 grader will not crank despite a fully charged battery, starter stays silent p. 387
Check the electrical troubleshooting chart on page 387 first. Measure voltage drop between the starter solenoid and positive battery post; anything above 0.2 volts points to a bad connection. Inspect the jumper wire from starter to battery on page 382 and verify starter mounting bolts are torqued to 65 Nm (48 lb-ft) per page 400.
Manual Section: Electrical System Troubleshooting (General)Solenoid audibly engages pinion into the flywheel but the starter motor never turns over
Follow the starter circuit diagnosis. Connect a voltmeter at the starter during crank; voltage must stay above 10 volts per the page 390 spec. If it sags below that while current draw exceeds 375 amps, pull the starter and bench test the armature for a shorted winding.
Manual Section: Electrical System Troubleshooting (General)Heavy electrical drain or intermittent cranking failure that comes and goes with no clear pattern p. 400
Pull the starter and inspect its mounting bolts and chassis ground stud for corrosion; torque bolts to 65 Nm (48 lb-ft) per page 400. Clean both ground points to bare metal and recheck. Voltage drop across the ground cable must stay under 0.2 volts per the page 392 spec, or replace the cable.
Manual Section: Electrical System Troubleshooting (General)Transmission drops into Go Home mode and limits gear selection to one per direction p. 209
Check the control valve unit's socket head mounting screws; torque to 20 Nm (14.7 lb-ft) as specified on page 209, since loose screws trigger false TCU faults and force Go Home mode. Test the controller switch output with PR 78; if there's no current at the output, replace the controller per page 212.
Manual Section: Transmission TroubleshootingStarter turns over slowly and struggles to crank the engine in cold weather p. 392
Bench test the starter with a no load test; armature speed should read between 7500 and 8500 rpm per the page 392 spec, with current draw not exceeding 170 amps. Slow armature speed with high current draw points to worn bushings or a dragging armature; check armature end play against the 0.3 mm (0.012 in.) limit on page 399.
Manual Section: Electrical System Troubleshooting (General)Frequently Asked Questions
What are the torque specs for wheel lug nuts on New Holland RG80 RG100?
The torque specifications for front wheel lug nuts on the New Holland RG80 RG100 road grader are 440-475 Nm (325-350 lb-ft). This applies to both LH and RH front wheels, as well as the rear wheel assemblies.
What are the torque specs for the blade pivot bolts on New Holland RG80 RG100?
The torque for the bolts securing the upper moldboard guides, which are related to the blade pivot, is 1,085 +/- 136 Nm (800 +/- 100 lb-ft.). Shims should be adjusted to provide 0.000-0.127 mm (0.00-0.005 in.) clearance.
What are the replacement specifications for Starter solenoid?
The manual specifies the starter motor as a 12 Volt unit with a solenoid, but it does not provide separate replacement specifications for the solenoid itself. If the solenoid is defective, the troubleshooting guide suggests to "Replace or repair starter."
How do you fix new Holland RG80 grader will not crank despite a fully charged battery, starter stays silent?
Check the electrical troubleshooting chart on page 387 first. Measure voltage drop between the starter solenoid and positive battery post; anything above 0.2 volts points to a bad connection. Inspect the jumper wire from starter to battery on page 382 and verify starter mounting bolts are torqued to 65 Nm (48 lb-ft) per page 400.
What format is this manual in?
You get a 664-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Is this New Holland Construction RG80, RG100 Service Manual printable?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Can I find hydraulic circuit diagrams in this New Holland Construction RG80?
Yes. The manual includes hydraulic circuit diagrams, system schematics, and component specifications with pressure ratings.
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