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Part of the John Deere Repair Manuals.
Tired of guessing at hydraulic pressures on your machine? All 550 pages of this John Deere JD401-C technical manual PDF (OEM #TM1092) focus on getting your loader and backhoe back to factory condition. Inside, you get high-quality hydraulic schematics mapping out the entire rockshaft system, plus complete wiring diagrams for the starting and ignition circuits. Open to the system testing section to find step-by-step diagnostic procedures for the reverser, continuous running PTO, and 9250 backhoe control valves. Torque the backhoe cylinder gland nuts to 210 lb-ft and verify the main hydraulic pump flow rates before buttoning up the transmission. Stop throwing expensive parts at a weak hydraulic system. Download this bookmarked file directly to your tablet, jump straight to the right procedure, and get back to work.
What's Inside This John Deere JD401-C Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 4-10 | Fos Manuals, Technical Manuals, Maintenance Without Accident, General Information, System Operation, Diagnosis, Visual Inspection, Testing |
| General Information | 11-48 | Specifications, Pre-Delivery Services, Lubrication |
| Engine | 49-128 | Engine Removal and Installation, Basic Engine, Engine Lubrication System, Engine Cooling System, Fuel System, Speed Control Linkage, Air Intake System |
| Electrical System | 129-182 | Batteries, Charging System, Starting System, Ignition System, Gauges and Switches, Specifications and Special Tools |
| Power Train | 183-236 | Clutch Assemblies, Transmission, Reverser, Continuous Running PTO, Differential and Parking Brake, Final Drives, Specifications and Special Tools |
| Hydraulic System | 237-370 | Transmission Pump, Main Hydraulic Pump, Reverser Clutch Control Valve, Pressure Control Valve, Steering Valve, Brake Valve, Loader Control Valve, 9250 Backhoe Control Valve |
| Miscellaneous Components | 371-408 | Front End Assembly, Loader Frame, Boom and Bucket, 9250 Backhoe Frame, Boom, Dipperstick, And Bucket, 9250-A Backhoe Frame |
| System Testing & Diagnostics | 409-542 | General Information, Engine Tests, Electrical System Tests, Power Train Tests, Hydraulic System Tests, Hydraulic Analyzer, Miscellaneous Components, Specifications and Special Tools |
| Alphabetical Index | 543-550 | Index of Sections, Groups and Procedures |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Torque for pump rear cover attaching cap screws | 35 lb-ft [47 Nm] | p. 82 |
| Impeller fins flushness with metal rim of pump housing | within 0.010 inch [0.254 mm] | p. 81 |
| Radiator test pressure (diesel and gasoline) | 10 psi (1 bar) | p. 165 |
| Battery BCI Group Size | 24 | p. 161 |
| Spark plug torque | 35 lb-ft [47 Nm] | p. 163 |
| Spark plug gap | 0.025 inch [0.64 mm] | p. 163 |
John Deere JD401-C Common Problems This Manual Covers
Hydraulic pump cavitation noise at operating temperature increases during heavy mowing loads
Check hydraulic oil level and confirm the reservoir is not low or aerated; engine lubrication capacity including filter is 9 qt. on page 106. Verify pump shaft end play measures 0.002 to 0.006 in. (0.051 to 0.152 mm) per page 240; excessive play draws air into the suction side and causes cavitation at temperature.
Manual Section: Hydraulic System p. 240Hydraulic system loses pressure quickly after filter change, relief valve chatters under load
Pull the relief valve and check spring free length; it should measure 2.0 in. (50.8 mm) and compress to 1.31 in. (33.3 mm) under 30 to 38 pounds (134 to 169 N) per page 316. A weak or broken spring lets the valve chatter and bleed pressure under load. Replace the spring and reseat the valve with a new seal.
Manual Section: Hydraulic System p. 316Frequently Asked Questions
What are the torque specifications for John Deere 401-C engine bolts?
For the John Deere 401-C engine, the cylinder head to block cap screw torque for both diesel and gasoline engines is 95 lb-ft (129 Nm). Additionally, the main bearing caps to block cap screw torque for diesel and gasoline engines is 85 lb-ft (115 Nm). p. 105
How do you fix john Deere JD401-C hydraulic pump clattering noise up front, loader bucket shudder, steering wheel shaking or freezing?
Check hydraulic fluid level and inspect the return filter strainer screens for debris causing pump starvation. Verify stand by pressure reads 2300 to 2400 psi (159 to 165 bar) on page 246; if low, adjust the stroke control valve adjusting screw. Drain and refill with correct viscosity oil, tank capacity varies by configuration. p. 246
How do you fix intermittent loss of steering and loader function during operation, control returns after machine sits idle?
Inspect the loader control valve spool detent screws and tie bolts for looseness allowing internal oil bypass from pressure to tank side. Torque detent screws to 5 to 8 lb-ft (7 to 11 Nm) and tie bolts to 20 to 25 lb-ft (27 to 34 Nm) as shown on page 279. Replace worn spool seals if leakage continues after retorque. p. 279
How do you fix machine fails to reverse while forward gear engages normally, no response from reverser control lever?
Remove and inspect the reverser clutch control valve for scoring or sticking; the valve O.D. should measure 0.6852 to 0.6862 in. (17.404 to 17.430 mm) as listed on page 354. Check the detent spring free length of 1.16 in. (29.5 mm) and replace if collapsed. Clean the valve bore and reinstall with fresh seals before retesting reverse engagement. p. 354
Is this John Deere JD401-C manual a digital?
This is a 550-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Are there any print restrictions on this John Deere JD401-C, JD401-C Loader?
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 John Deere JD401-C, JD401-C?
Yes, a hydraulic system diagram is included showing the main circuit layout.
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