John Deere JD510 Backhoe Loader 1979 Technical Manual (P/N TM-1039)

John Deere technical manual TM-1039 covers service and repair of the 1979 JD510 Loader Backhoe. This copy includes revised service pages dated through December 1980; its transmission overhaul coverage centers on the Power Shift system.

Text Search, Bookmarks, and Schematic Detail

Finding procedures and reading diagrams: Embedded OCR text supports searches through the service sections, although recognition errors can affect exact matches and some schematic lettering is not searchable. PDF bookmarks reach the major sections and many individual procedures. Small wiring and hydraulic labels require zooming; some diagrams also need rotation.

The download contains one printable, 400-page PDF in English. That total includes the front cover, rear safety cover, and two unnumbered blank pages.

Engine, Power Shift, and Hydraulic Service

The following selected topics show the repair and diagnostic coverage rather than reproduce the complete contents. Other documented work includes fuel-gauge testing and cab pressurizer service.

• Engine repair: Step-by-step procedures for cylinder-head service, wet cylinder liners, pistons, crankshaft bearings, camshaft work, and engine-balancer repair.

• Fuel system: Transfer-pump diagnosis, filter service, air-intake checks, and Roosa-Master JDB injection-pump removal, installation, timing, and advance adjustment.

• Power train: Disconnect-clutch repair, Power Shift pressure and drag tests, transmission overhaul, PTO service, differential adjustment, and planetary final-drive work.

• Electrical diagnosis: Starting-circuit tests, Delco-Remy and John Deere starter repair, alternator checks, wiring diagrams, and harness-connector identification.

• Hydraulic testing: Pump flow and standby-pressure checks, analyzer-based fault isolation, leakage tests, stroke-control adjustment, and hydraulic-pump rebuilding.

• Steering and brakes: Serial-specific steering-valve repair, synchronization and bleeding, wet-disk brake service, pedal adjustment, and accumulator testing.

• Loader and backhoe equipment: Control-valve repair, cylinder overhaul, Drott 4-in-1 bucket clam cylinders, and extendible dipperstick service.

Written for experienced service technicians, this manual assumes familiarity with workshop practices and the use of measuring equipment and special tools.

Engine Access and Internal Repair

The separation procedures provide a clear roadmap for component access, covering engine removal, clutch-housing separation, and final-drive removal. They help technicians plan major work before opening the assemblies.

Internal engine coverage extends to liner inspection, main-bearing checks, balancer timing, and rear crankshaft sealing. Component specifications distinguish new-part dimensions from wear limits. Cylinder-head service includes staged tightening, the tightening sequence, and checks following engine run-in.

Cooling-system work includes water-pump disassembly, bearing and seal replacement, and thermostat testing. Periodic service charts and lubrication guidance support routine maintenance alongside these repairs.

Roosa-Master Injection-Pump Coverage

The fuel section identifies the JDB431 AL2401 pump and documents drive-shaft seal handling, static timing, and advance checks. Detailed internal injection-pump and nozzle service is referred to the separate SM-2045, which is not included.

Early and later transfer pumps receive different service treatment: the earlier design has repair procedures, while the later pump is replaced as an assembly.

Power Shift Diagnosis and Overhaul

Transmission pressure-test points, the Clutch and Brake Engagement chart, and the drag test connect operating symptoms with individual clutch and brake elements. Repair coverage continues through the control valves, transmission pump, planetary packs, reduction gearing, and shift adjustments.

The Tooth Bearing Pattern illustration supports differential-drive setup. PTO clutch and brake tests are documented separately from transmission testing.

Collar-Shift scope: The revision listing deletes the dedicated Collar-Shift clutch, transmission, and PTO groups. Earlier references remain elsewhere, but those overhaul chapters are not included in this copy.

Electrical and Hydraulic Fault Isolation

Electrical schematics distinguish machines with and without a cab. Serial-specific Wire Routing drawings and connector charts relate wire colors and circuit numbers to their destinations.

Hydraulic schematics, the Symptom Index, and the Test Pattern Analysis Chart support fault isolation before component removal. Analyzer procedures cover function leakage, cylinders, the transmission pump, differential lock, and brake accumulator. Tool references include the D-01080AA hydraulic system analyzer and JD293 transmission pump filter kit.

The disconnect-clutch section explains how running with the transmission oil pump disconnected can damage the main hydraulic pump. Accumulator service specifies dry nitrogen and explains the seal damage associated with unsuitable charging gases.

Prior to hydraulic circuit testing or powertrain disassembly, review the factory precautions for stored pressure, supported equipment, and heavy components.

Dipperstick, Cylinders, and Structural Repairs

Exploded views and cylinder cutaways show seal, packing, and retaining-component relationships. Extendible dipperstick coverage reaches the telescoping assembly, bearing strips, control linkage, and extension cylinder.

The structural sections also address front-axle pivots, loader and backhoe pins, wedge bushings, and bucket cutting-edge welding requirements.

A Preview of Engine Checks and PTO Test Data

The preliminary engine-test table lists compression of 400 psi at 275 rpm. Valve-clearance references specify 0.018 inch for the intake valves and 0.028 inch for the exhaust valves.

For the Power Shift PTO, the clutch-pressure test specifies 175 ± 5 psi at 1900 engine rpm with the PTO clutch engaged. Separate brake-pressure checks accompany the clutch test.