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Caterpillar 308D CR Series Excavators Factory Service & Shop Manual
Complete workshop & service manual with electrical wiring diagrams for Caterpillar 308D CR Series Excavators. It’s the same service manual used by dealers that guaranteed to be fully functional and intact without any missing page.
Caterpillar 308D CR Series Excavators service & repair manual (including maintenance, overhaul, disassembling & assembling, adjustment, tune-up, operation, inspecting, diagnostic & troubleshooting…) is divided into different sections. Each section covers a specific component or system with detailed illustrations. A table of contents is placed at the beginning of each section. Pages are easily found by category, and each page is expandable for great detail. The printer-ready PDF documents work like a charm on all kinds of devices.
MANUAL LIST:
KENR6164 – Systems Operation (308D CR Excavator Hydraulic System)
KENR6165 – Testing and Adjusting (308D CR Mini Hydraulic Excavator Hydraulic System)
KENR6799 – Specifications (308D, 314D, 321D and 328D Excavators Air Conditioning and Heating)
KENR6799 – Systems Operation (308D, 314D, 321D and 328D Excavators Air Conditioning and Heating)
KENR6799 – Testing and Adjusting (308D, 314D, 321D and 328D Excavators Air Conditioning and Heating)
KENR7708 – Schematic (308D Excavator Hydraulic System)
KENR8224 – Schematic (308D CR SB Excavator Electrical System)
RENR9740 – Disassembly and Assembly (308D CR Excavator Engine Supplement)
RENR9741 – Disassembly and Assembly (308D CR Excavator Machine Systems)
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EXCERPT:
Blade RAISE
During a BLADE RAISE operation, the oil delivery from main pump (20) flows through line (19) to parallel feeder passage (5) in main control valve (2). Oil flows to blade control valve (12) .
Pilot pump (21) supplies oil to pilot control valve (16) through line (15). When the joystick for the blade is moved to the full BLADE RAISE position, the pilot oil flows from pilot control valve (16) through pilot line (13). The pilot oil flows to blade control valve (12) .
The pilot oil flow shifts blade control valve (12) for BLADE RAISE operation. The oil delivery from the main pump in parallel feeder passage (5) flows through passage (8) through blade control valve (12). The oil delivery from the main pump then flows through line (6) to the head end of blade cylinder (1) .
Return oil from the rod end of blade cylinder (1) flows through line (11) to blade control valve (12). The oil then flows through passage (9) and through return line (17) and line (18) to the hydraulic tank (23) .
Blade FLOAT
In the FLOAT position, no pump oil is supplied to the blade cylinder. No hydraulic control is used on the blade cylinder. The mass (size and weight) of the blade causes the blade to stay on the ground. The FLOAT position is suitable for levelling work on a soft surface.
When the blade control lever is moved forward into the detent position, the blade is placed in the FLOAT position. Blade control valve (12) shifts for the FLOAT operation. This allows oil to flow from the rod end of the cylinder and the head end of the cylinder through blade control valve (12).
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