When the hydrostatic drive starts pulsing or a steering lever won't neutralize, the four skid-steer loaders in Sperry New Holland's L-series all point back to the same 214-page factory service manual, OEM 40003531. Hydraulic circuit diagrams in this Sperry New Holland L-35, L-775, L-778, L-779 service manual PDF trace oil flow through the loader valve and steering circuits, and separate chapters carry you through Vickers and Cessna transmission overhauls from removal through pump and motor shimming. A dedicated troubleshooting section pairs symptoms with causes, and the cylinder rebuild procedures cover both bucket and boom cylinders down to seal replacement. Verify Vickers charge pressure against the 65 psi (4.5 bar) spec, then torque wheel lugs to 150 ft. lbs. (202 N·m) on reassembly. One made-up pressure figure can take out a rebuilt transmission. Download the bookmarked, text-searchable PDF and know which gear-sprocket casting your final drive takes before you order it.
What's Inside This Sperry New Holland L-35, L-775, L-778, L-779 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 3-7 | Personal Safety |
| Introduction | 8-9 | Hydrostatic Drive, Four-Way Gearbox, Steering Levers, Hydrostatic Pulsations, Tractive Effort |
| Servicing Vickers-Equipped Loaders | 10-59 | Vickers Transmission Removal, Hydrostatic Transmission Operation, Vickers Transmission Disassembly, Vickers Transmission Pump and Motor Shimming |
| Servicing Cessna-Equipped Loaders | 60-124 | Cessna Transmission Removal, Cessna Transmission Overhaul, Cessna Transmission Oil Leaks, Shimming Four-Way Gear Box, System Cleaning Procedure After Transmission Overhaul |
| General Information - Vickers and Cessna-Equipped Skid-Steer Loaders | 125-207 | Start-Up Procedure, Final Drive Disassembly and Assembly, Hydraulic System Pressure Checks, Servicing the Control Valve, Rebuilding Bucket and Boom Cylinders, Electrical System |
| Adjustable Fittings | 208 | O-Ring Lubrication, Metal Back-Up Washer, Straight Thread Boss, Lock Nut, Fitting Positioning |
| Bite-Type Flareless Fittings | 209 | Ferrule Installation, Tube Preparation, Tube Bottoming, Wrench Torque, Ferrule Bite Inspection |
| Tube Fitting Trouble Shooting | 210 | Flared Tube Angle, Embedded Burrs, Indented Seams, Nose Scratches, Seal Line Contact, Tube Alignment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Wheel lug torque | 150 ft. lbs. (202 N·m) | p. 143 |
| Sprocket retaining cap screw torque | 85 ft. lbs. (115 N·m) | p. 140 |
| Brake disc cap screw torque | 35 ft. lbs. (47 N·m) | p. 142 |
| Old model gear-sprocket backlash | .004”-.008" (.012-.203 mm) | p. 136 |
| New model gear-sprocket backlash | .010"-.014” (.254-.356 mm) | p. 136 |
| Main system relief valve pressure | 2,000-2,250 psi (13,790-15,510 kPa) | p. 144 |
| Main line filter (L-35) | 25 Micron | p. 181 |
| Transmission filter (L-35) | 10 Micron | p. 181 |
| Main system pressure | 2200-2400 psi | p. 194 |
| L-35 | ||
| Main System Relief Valve Pressure (L-35) | 2000 psi | p. 181 |
| L-775 | ||
| Main System Relief Valve Pressure (L-775) | 2000 psi | p. 182 |
| L-778 | ||
| Main System Relief Valve Pressure (L-778) | 2000 psi | p. 184 |
Sperry New Holland L-35, L-775, L-778, L-779 Common Problems This Manual Covers
Sperry New Holland L-35 skid steer stalls within 30 seconds of starting and will not stay running
Check whether the hydrostatic transmission is dragging the engine down; verify both steering levers return fully to neutral before restarting. Test charge pressure at the plug on the oil cooler; the spec on page 192 is 65 psi. Low charge pressure points to a plugged 10 micron transmission filter or a worn charge pump starving the hydrostat.
Manual Section: General Information - Vickers and Cessna-Equipped Skid-Steer Loaders p. 192Loader will not turn to one side while all other functions work normally
Check the steering lever linkage for binding or a disconnected rod before condemning the transmission. Swap drive lines between motors to isolate a weak pump section from a failed motor. Verify charge pressure at the oil cooler plug holds 65 psi, then follow the steering control checks in the troubleshooting chart starting on page 194.
Manual Section: Vickers Transmission Troubleshooting p. 194Boom lifts slowly or moves jerky and bucket tilt feels weak under load
Check main system pressure with the boom circuit dead-headed; the troubleshooting chart on page 194 calls for 2200-2400 psi (15,169-16,548 kPa). Low or erratic readings point to a worn pump or a sticking relief valve. Drain and inspect the hydraulic oil for contamination and foaming, and change the filters before tearing into the pump; scored parts start with dirty oil.
Manual Section: Hydraulic Pump TroubleshootingGrinding or clunking from the chain case, drive wheels slip a beat under load
Drain the chain case and inspect the sprockets and pinion for worn tooth profiles. Set gear-sprocket backlash to .010"-.014" (.254-.356 mm) on the newer gear set per page 136. Adjust the draw bolt until you get about 1/4" (6 mm) of movement at the tire circumference, then torque the clamp bolts to 140 ft. lbs. (190 N·m).
Manual Section: General Information - Vickers and Cessna-Equipped Skid-Steer Loaders p. 136Wheel sprocket bolts keep backing off and hub hardware works loose during loader work
Pull the wheel and inspect the sprocket bolt holes for elongation before re-torquing. Torque the wheel sprocket bolts to 85 ft. lbs. (115 N·m) per the chart on page 207, and pull the wheel lugs to 150 ft. lbs. (202 N·m). Recheck both after the first few hours of loader work; stretched bolts need replacement.
Manual Section: General Information - Vickers and Cessna-Equipped Skid-Steer Loaders p. 207Frequently Asked Questions
What is the torque specification for the wheel lug bolts on the L-35, L-775, L-778, and L-779 loaders?
The wheel lug bolts for these loaders must be tightened to a torque of 150 ft. lbs. (202 N·m). p. 143
What is the recommended torque for the bucket cylinder piston nut on a Cessna-equipped L-35 loader?
The piston nut for the Cessna bucket cylinder should be torqued to 180-200 ft. lbs. (243-270 N·m). p. 155
What is the correct charge pressure reading for Vickers transmissions in Sperry New Holland L-35, L-775, L-778, L-779?
A charge pressure reading of 65 psi (4.5 bar) minimum should be observed within a few seconds of start-up. If this pressure is not reached, operation should cease immediately to determine the cause of the loss. p. 125
What is the required torque for the final drive spindle cap screws on the Sperry New Holland L-35, L-775, L-778, L-779?
The cap screws for the spindle must be torqued to 290 ft. lbs. (392 N·m). p. 139
What is the specified valve clearance for the intake and exhaust valves on the L-35 VG4D engine?
For the VG4D engine, the intake valve clearance (cold) is 0.008" (0.203 mm) and the exhaust valve clearance (cold) is 0.016" (0.406 mm). p. 181
How quickly can I access this Sperry New Holland L-35 manual after buying?
A single searchable PDF file of 214 pages, downloadable right after payment. Nothing ships, nothing waits in the mail.
Does this Sperry New Holland L-35 manual allow printing?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
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