D250E Series II and D300E Series II Articulated Trucks Machine Systems Caterpillar

Hydraulic Oil Filter and Bypass Valve - Remove

Usage:

Removal Procedure

Start By:

Tilt the cab. Refer to Disassembly and Assembly, SENR9124, "Cab - Tilt".

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At operating temperature, the hydraulic tank is hot and under pressure.
Hot oil and components can cause personal injury. Do not allow hot oil or components to contact skin.

Remove the filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. Remove the filler cap slowly in order to relieve pressure.

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NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products. Dispose of all fluids according to local regulations and mandates.

Note: Turn off the engine. Apply the foot brake valve several times in order to relieve the pressure in the brake system.

Put identification marks on all lines, hoses, wires, and tubes for installation purposes. Plug all lines, hoses and tubes. This helps prevent fluid loss and contamination of the oil system.
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Illustration 1 g00442603
Remove seven bolts (1) and cover (2) from the hydraulic tank.
In order to remove the bypass valve, drain the hydraulic tank. The capacity of the hydraulic tank is 140 L (37 US gal).
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Illustration 2 g00442903
Loosen bolt (3) that secures the oil filter assembly and oil filter cover (4) to the hydraulic oil tank.
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Illustration 3 g00442904
Remove the oil filter assembly and the oil filter cover as one unit (5).
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Illustration 4 g00442905
In order to remove cotter pin (6) from the bolt, compress the oil filter assembly toward the oil filter cover against the spring.
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Illustration 5 g00442906
Slowly release the spring tension and remove washer (7), screen assembly (8), and two filter elements (9) from the oil filter assembly.
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Illustration 6 g00442908
Place the oil filter assembly in a hydraulic press. Compress the springs under the retainer. Remove the pin (10) from bolt (11).
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Illustration 7 g00442907
Slowly release the spring tension from the assembly. Remove retainer (12), spring (13), valve (14), seat (15), spring (16), and O-ring seal (17) from bolt (11) on the filter cover.
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Illustration 8 g00452661
Locate the access plate directly below the hydraulic tank under the frame.
Loosen two bolts (18) on the access plate. Swing the access plate open.
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Illustration 9 g00435664
Remove two bolts (19) and two washers (20) that secure the bypass valve assembly to the bottom of hydraulic tank (21).
Remove valve guide (22), spring (23), valve (24) and O-ring seal (25) from bypass valve body (26).
Remove drain plug (27) and O-ring seal (28) from the bypass valve body.