Procedure To Test And Adjust 5P4210 Cab Tilt Cylinder Arrangement{0623} Caterpillar

The 5P4210 Cab Tilt Cylinder Arrangement is equipped with valves which will not permit the cab to make sudden moves when the cab goes over center as it is raised or lowered. If these valves are not correctly adjusted, the cab can make sudden movements as it goes over center. If service work is done on the cylinder or valves, it is necessary to check and adjust the pressure settings on the valve so the cylinder will operate correctly. See page 4 for the extra parts needed to check and adjust the cylinders. See the instruction that follows for the correct test and adjustment procedures.

(1) To check the retract relief valve adjustment, connect the pump hose with the pressure gauge to opening (A). Connect the other hose to opening (B). Put the cylinder rod in the fully retracted position. Operate the pump to send pressure oil to opening (A). The gauge reading should be 6200 ± 200 psi (42880 ± 1380). To adjust the pressure, release the pressure from the cylinder and remove plug (C). Turn the screw behind plug (C), clockwise to increase the pressure and counterclockwise to decrease the pressure. Hold a cover over the opening and operate the pump to check the pressure setting.

(2) To check the retract hold valve adjustment, connect the hose without the gauge to opening (A). Use the 6V1389 Connector and 6V1390 Coupling with a 4J7533 O-ring to connect the pump hose with the gauge to opening (D). Operate the pump to send pressure oil to opening (D). Check the gauge; the pressure should be 5500 ± 100 psi (3800 ± 690). To adjust the pressure, loosen the locknut and turn the screw in valve (E) clockwise to increase the pressure and counterclockwise to decrease the pressure.

(3) To check the cylinder rod extend relief valve, connect the pump hose with the gauge to opening (B) and connect the other hose to opening (A). With the cylinder rod fully extended, operate the pump to send pressure oil to opening (B). Check the gauge; the pressure should be 4000 ± 200 psi (27580 ± 1380). To adjust the pressure, release the pressure from the cylinder. Remove plug (F). Turn the screw behind the plug clockwise to increase the pressure and counterclockwise to decrease the pressure. Hold a cover over the hole where plug (F) was removed and operate the pump to check the pressure setting.

(4) To check the extend hold relief valve, use the 6V1389 Connector and 6V1390 Coupling to connect the hose with the gauge to opening (G) and connect the other hose to opening (B). Operate the pump to send pressure oil to opening (G). Check the gauge; the pressure should be 3200 ± 200 psi (22000 ± 1380). To adjust the pressure, loosen the locknut and turn the screw in valve (H) clockwise to increase the pressure and counterclockwise to decrease the pressure.

Parts Needed