![John Deere JD302-A Repair Manual [Backhoe Loader]](https://youfixthis.com/wp-content/uploads/2012/02/Manual_Download-300x300.jpg)
Part of the John Deere Repair Manuals.
Need the factory specs for your JD300-B? This 596-page John Deere JD300-B Technical Manual PDF (OEM #TM-1087) breaks down every system on your loader and backhoe loader. You get complete hydraulic schematics for the main pump and control valves, full wiring diagrams, and step-by-step teardown procedures for the engine and power train. Open up the hydraulic section to find exploded views of the reverser, final drives, and differential, plus heavy-duty troubleshooting charts for every major circuit. Lock down the ring gear and pinion shaft nut to 160 lb-ft and verify your transmission pump end play sits exactly between 0.001 and 0.005 inches. Stop throwing parts at a weak hydraulic circuit. Download this bookmarked, text-searchable file to your tablet and drag it right under the machine to get the job done right.
What's Inside This John Deere JD300-B Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 4 | Fos Manuals, Technical Manuals, General Specifications and Services, Component Removal, Repair, Testing, Installation, And Adjustment |
| Maintenance Without Accident | 5-8 | Work Safely, Maintenance Area, Fire Hazards, Maintenance Conditions, Servicing Precautions, Precautions During Repair |
| General | 9-46 | General Machine Specifications, Predelivery, Delivery, And After-Sale Services, Lubricants |
| Engine | 47-128 | 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 | 237-400 | 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 | 401-438 | Front End Assembly, Loader Frame, Boom, And Bucket, 9250 Backhoe Frame, Dipperstick |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Tighten cap screws | 75 lb-ft (101 N·m) | p. 55 |
| Retighten cap screws | 95 lb-ft (129 N·m) | p. 55 |
| Ring gear and pinion shaft nut | 160 lb-ft (22.121 kg-m) | p. 233 |
| End play | 0.001 to 0.005 in. (0.03 to 0.13 mm) | p. 243 |
| Cooler bypass and relief valve spring free length | 2.80 in. [71.0 mm] | p. 285 |
| Cooler bypass and relief valve spring test length | 2.05 in. [52.0 mm] at 20 ± 2 pounds [9.0 ± 0.9 kg] force | p. 285 |
| Pump shaft end play | 0.001 to 0.005 in. (0.03 to 0.13 mm) | p. 243 |
| Pressure control valve spring free length | 4-5/8 in. [117.8 mm] | p. 288 |
| Pressure control valve spring compressed length | 3-1/2 in. [88.9 mm] with 45 to 55 lbs. [20.4 to 24.9 kg] | p. 288 |
| Oil Filter Relief Valve spring free length | 2.56 in. [65.0 mm] | p. 343 |
| Oil Filter Relief Valve spring compressed length | 1.31 in. [33.3 mm] | p. 343 |
John Deere JD300-B Common Problems This Manual Covers
JD300-B hydraulics work initially but slow down and quit completely, bucket won't lift
Check the pump drive coupler splines for wear. Pump shaft end play should measure 0.001 to 0.005 in. (0.03 to 0.13 mm) as specified on page 243. Inspect both coupler halves and retighten the cap screws to 25 ± 2 lb-ft (3.46 ± 0.28 kg-m) per page 283. Replace worn splines or a cracked coupler before running the pump under load again.
Manual Section: Hydraulic System p. 243Hydraulic pressure drops to roughly 1500 PSI during the second loader lift cycle
Tap a calibrated gauge into the pressure control circuit and cycle the loader twice. The relief valve should hold 2750 psi (193 kg/cm²) as specified on page 389; a drop on the second stroke points to a scored seat or weak spring. Pull the valve, inspect the seat for wear, and work through the diagnosing procedures before you condemn the pump itself.
Manual Section: Hydraulic System p. 389Tractor runs but delivers noticeably low power on hard pulls, mechanic suspects blown compression rings
Run a compression test on all cylinders before pulling the head; work through the lack-of-power diagnosing steps starting. Confirm crankshaft end play falls within 0.0020 to 0.0080 in. as specified on page 105, since excess play skews readings. Low, uneven compression across cylinders confirms worn rings and calls for an in-frame overhaul, not just an injector swap.
Manual Section: EngineBackhoe control valve chatters and hesitates in cold start after sitting idle for weeks
Pull the oil filter relief valve and check for sludge fouling the seat; its spring should show a free length of 2.56 in. (65.0 mm) per page 343. Clean the function return filter screen too, where the valve spring free length runs 2.0 in. (50.8 mm) per page 344. Flush the reservoir and refill with clean fluid before cycling the backhoe controls again.
Manual Section: Hydraulic System p. 343Pressure control valve keeps leaking oil even after replacing every seal and O-ring
Stop chasing seals and test the valve spring itself. Free length should measure 4.61 in. (117.0 mm), compressing to 3.50 in. (89.0 mm) under 50 ± 5 lbs. of force, per pages 385 and 386. A fatigued or collapsed spring leaves the valve unseated under pressure, and it will keep weeping oil no matter how many new O-rings you install.
Manual Section: Hydraulic System p. 385Frequently Asked Questions
How to reset hydraulic pressure on John Deere JD300-B?
The manual does not describe a 'reset' procedure for hydraulic pressure, but rather adjustment procedures. For the Pressure Control Valve, adjustment involves adding or removing shims to increase or decrease the valve setting, as detailed on page 531. For the Reverser Clutch Control Valve, shims are added or removed to achieve the correct pressure setting, as described on page 533. p. 531
What are the torque specifications for John Deere JD300-B engine head bolts?
The engine head cap screws should be tightened in sequence to 75 lb-ft (102 N-m). After this initial tightening, they should be retightened in sequence to 95 lb-ft (129 N-m). This procedure should be followed after break-in as well. p. 103
How to reset the hydraulic pump on a John Deere 300B backhoe?
The manual does not describe a 'reset' procedure for the hydraulic pump. Instead, it outlines adjustment procedures, such as readjusting the main hydraulic pump stroke control valve to achieve a standby pressure of 2300 to 2400 psi [161.7 to 168.7 kg/cm²] at 2500 rpm, as detailed on page 530. p. 530
What is the torque specification for the John Deere 300B transmission bolts?
For the John Deere 300B transmission, the ring gear and pinion shaft nut should be torqued to 160 lb-ft (22.121 kg-m) and then staked in place. p. 233
How will I receive this John Deere JD300-B, JD300-B Loader and Backhoe Loader?
Immediate download of the complete 596-page searchable Technical Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Can I print this John Deere JD300-B, JD300-B Loader and Backhoe Loader manual?
Zero restrictions. The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Are electrical wiring diagrams included in this John Deere JD300-B, JD300-B?
A wiring diagram for the John Deere JD300-B, JD300-B Loader and Backhoe Loader electrical system is included.
Reviews
There are no reviews yet.