Hydraulic System Tests

Tilt Cylinder Rod End Pressure Test

1.Stop the engine if necessary.

Caution

A pressure gauge with a minimum of 414 bar (6000 psi) is required. Damage may result to gauges if they are of insufficient capacity.

2.Using a tee fitting, connect a pressure gauge with a minimum capacity of 414 bar (6000 psi). into the rod-end port connection (Q, Fig. 530) on the tilt cylinder.

Lift Cylinder Base End Pressure Test

1.Stop the engine if necessary.

Caution

A pressure gauge with a minimum of 414 bar (6000 psi) is required. Damage may result to gauges if they are of insufficient capacity.

2.Using a tee fitting, connect a pressure gauge with a minimum capacity of 414 bar (6000 psi). into the rod-end port connection (P, Fig. 531) on the lift cylinder.

3.Run the machine until the hydraulic oil reaches operating temperature (approximately 60°C/ 140°F).

4.Use the hand throttle to set engine speed to low idle (1000 rpm).

5.Push the right joystick to the left and tilt the attachment hitch all the way back until it stops.

6.While an assistant observes the pressure reading on the gauge, push the right joystick to the left. The pressure reading should be 237-245 bar (3448-3552 psi) with the engine at low idle (1000 rpm).

7.Release the right joystick.

8.Stop the engine and remove the pressure gauge and tee fitting from rod-end port connection (Q) on the tilt cylinder.

3.Run the machine until the hydraulic oil reaches operating temperature (approximately 60°C/ 140°F).

4.Use the hand throttle to set engine speed to low idle (1000 rpm).

5.Pull the right joystick back (ISO control pattern controls), or push the left joystick to the left (DH control pattern controls) and raise the lift arm as far as it will go.

Warning

Never allow anyone under or near the lift arm when it is raised. Severe injury or death could occur if the lift arm lowers unexpectedly.

Make sure the assistant stands clear of the machine when reading the pressure gauge.

6.While an assistant observes the pressure reading on the gauge, pull the right joystick back. The pressure reading should be 237-245 bar (34483552 psi) with the engine at low idle (1000 rpm).

7.Lower the lift arm to the ground and release the right joystick.

8.Stop the engine and remove the pressure gauge and tee fitting from base-end port connection (P) on the lift cylinder.

Lift Cylinder Rod End Pressure Test

1.Stop the engine if necessary.

Caution

A pressure gauge with a minimum of 414 bar (6000 psi) is required. Damage may result to gauges if they are of insufficient capacity.

2.Using a tee fitting, connect a pressure gauge with a minimum capacity of 414 bar (6000 psi). into the rod-end port connection (X, Fig. 532) on the lift cylinder.