Chapter 6 Tirehand Repair 45
Tirehand Hydraulic Motors
Six hydraulic motors are used on the Tirehand: two for Tirehand rotation and one each side for
pad rotation, and teo for body rotation. These motors are not considered field repairable and
should be replaced if defective.
HYDRAULIC MOTOR REMOVAL AND REPLACEMENT
To remove rotation motor:
1 Disconnect and cap the hydraulic hoses.
2 Remove the two motor mounting bolts.
3 Remove the counterbalance block and hose fittings from the old motor.
To install the new motor:
1 Install the counterbalance block and hose fittings from the old motor. Do not use the old o-
rings - they should be replaced.
2 Position the motor on the base and install the two mounting bolts. Torque them to the
proper value (See Torque Table).
3 Connect the hoses.
4 Start the engine, rotate the Tirehand five (5) times in both directions and check for leaks.
5 With all cylinders retracted, check the fluid level in the reservoir and fill if necessary.
Tirehand Relief Valve Adjustment
The hydraulic system is designed to operate at a pressure requirement of 2500-3000 PSI
(172.4-206.8 bar) with an optimum oil flow of 15 GPM (56.8 lpm). If the unit pressure is less
than
2500 psi (172.4 bar), the unit relief valve may require adjustment or replacement. To adjust the
relief valve:
1 Start the vehicle and engage the pump.
2 With the vehicle transmission in neutral, operate any function full stroke and, with function
lever still engaged at end of stroke, read the pressure on the gauge at the control valve. It
should read between 2400-2600 psi (165.5 - 179.2 bar).
3 If the pressure reading is low, shut off the engine and adjust the relief valve. Loosen the nut
on the relief valve adjustment screw, then turn the screw to adjust the pressure. Check the
pressure, and continue adjustment if needed.
Summary of Contents for TH36K164
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