John Deere JD300-B Loader & Backhoe Technical Service Manual (TM-1087)

• Official John Deere publication TM-1087 (December 1978 revision)
• 596 pages of factory-authorized specifications detailing the engine, power train, electrical, and hydraulic systems
• Essential reference material for the 1978–1979 JD300-B Loader and Backhoe, outlining system diagnostics for the 3-cylinder diesel engine, hydraulic controls, and mechanical drive train
• Includes 47 exploded-view diagrams, 16 maintenance and adjustment charts, and 4 specialized torque-specification tables tailored for professional workshop environments

Engine and Hydraulic System Documentation

This factory publication provides a detailed technical overview of the JD300-B. Inside, you will find comprehensive documentation covering the mechanical engine, breaking down the cylinder head, valve train, and timing gear train assembly. The literature also reviews hydraulic system operations. It clearly outlines components like the transmission-hydraulic pump, steering valve, and brake valve. Need to run system diagnostic tests? The manual details visual inspections and measured pressure checks to help pinpoint operating issues efficiently. Additionally, the service sections review teardown and reassembly procedures, listing exact torque values for engine fasteners and hardware.

Specification Highlights

The technical data sections preview critical operating parameters and wear limits essential for heavy equipment maintenance. For instance, the engine assembly data specifies cylinder head bolt torque at 95 lb-ft. Hydraulic system specification charts document a maximum operating pressure of 2350 psi, while basic engine service tables list the main bearing bore I.D. at 3.3250 to 3.3260 inches. Please remember that working on heavy machinery carries inherent physical risks. Always rely on the complete, original OEM documentation and ensure all procedures are performed by qualified personnel equipped with the proper workshop tooling.