Case 1840 Skidsteer Service Manual

Table of Contents

1. General
2. Engines
3. Fuel System
4. Electrical
5. Power Train
6. Brakes
7. Hydraulics
8. Mounted Equipment
9. Rear Pocket

Manual Extract: Circuit Relief Valve

1. Connect a 690 bar (10 000 psi) pressure gauge to the test port.
2. If the hydraulic oil is not at operating temperature run the engine at full throttle and hold the bucket control lever in the Rollback position for 30 seconds. Then return the bucket control lever to Neutral for 15 seconds. Repeat this cycle until the temperature of the oil is at least 52Q C (125Q F).
3. Run the engine at low idle. Raise the seat bar and slowly move the direction control levers FORWARD until the pins for the parking latch engage each drive sprocket.
4. Continue to run the engine at full throttle. Move the control lever for the circuit being tested one half the distance of full travel and watch the pressure gauge. When the pressure stops increasing, read the pressure gauge and move the control lever to Neutral.
5. The correct pressure is 280 to 300 bar (4060 to 4350 psi). If the pressure is not correct, use a new circuit relief valve. You can temporarily repair a forward circuit by interchanging a functioning reverse circuit relief valve with the forward circuit relief valve.