Maintenance - Section 4 OM4006.1 06/98 Page 4-10 Lubrication and Service HYDRAULIC TANK SERVICE Filling Instructions 1. Lower the dump body, shut down the engine, and turn the keyswitch ‘‘Off’’. Hydraulic tank may be pressurized! Depress relief valve (2) and release hydraulic tank filler cap slowly to remove any internal pressure. 2. Depress relief valve (2, Figure 4-1) for 30 - 45 seconds to release any internal tank pressure. Turn the oil filler cap (4) slowly counterclockwise to release any posssible residual tank pressure. 3. Refer to ‘‘Lubrication Chart’’, Lube key ‘‘C’’. Fill tank with recommended oil, until oil is visible in the TOP sight glass (5). FIGURE 4-1. HYDRAULIC TANK 1.
Hydraulic Tank 2. Pressure Relief Valve 3. Breather 4. Filler Cap 5. Hydraulic Oil Level Upper Sight Glass 6. Hydraulic Oil Level Lower Sight Glass 7. Hydraulic Oil Drain NOTE: If Hydraulic tank has been completely drained, refill capacity is: 576 Liters (152 gal.) 4. Replace fill cap. 5. Start the engine, and raise and lower dump body 3 times to circulate oil and fill all lines, valves, cylinders, etc. 6. Repeat steps 1 through 5 and fill until oil level is again in the TOP sight glass (5). 7. If oil level falls below LOWER sight glass (6) with engine running , repeat steps 1. through 5.
HYDRAULIC TANK SERVICE When servicing the hydraulic tank, always follow the ‘‘Filling Instructions’’ described above to re- lieve any internal tank pressure before opening tank. 1. When checking oil level, or any other service, inspect the breather (3, Figure 4-2) to be certain that it is open to atmosphere. Clean any excess accumulations of dirt/mud, etc. from around the breather. Clean/replace breather element as necessary. Refer to ‘‘HYDRAULIC TANK BREATHER’’. FIGURE 4-2. HYDRAULIC TANK (TOP VIEW) 1. Hydraulic Tank 7. Diffusers 2. Pressure Relief Valve 8. Strainers 3. Breather 9. Wire Mesh Strainer 4. Filler Cap 10. Strainer 5. Sight Glass Guard 11. Diffuser 6. Access Cover 2.
Whenever oil is drained from tank, clean diffussers (7 & 11) and strainers (8, 9, & 10).