Section 6
Hydraulic System
20425603
5-2005/Rev 0
6-15
Figure 6-9: Pump Coupling Dimension
10. Loosen the pinch bolt in the pump coupling half on the old pump and remove the coupling
half. Inspect the metal splines for damage. If the coupling half is not damaged it can be
reused on the new pump.
Wipe any residue, dirt or oil from the pump coupling half. Slide the existing coupling
half, or a new coupling half if necessary, onto the splined shaft of the new pump.
11. Measure from the pump mounting face to the outer face of the coupling teeth, dimension
B in Figure 6-9. Set the position of the pump coupling half using the formula
B = (A – 0.313).
12. Tighten the pinch bolt and torque to 36 ft-lbs (49 Nm).
13. Position the hydraulic pump on the motor, ensuring the coupling teeth mesh into the
flexible coupling. Force should not be required.
14. Verify that the mating surfaces of the motor and pump meet without resistance from the
coupling.
15. Replace the pump mounting bolts and torque to 55 ft-lbs (75 Nm).
16. Install the recirculation pump.
NOTE
If the unit is equipped with an optional booster pump, install the adapter and
booster pump with the recirculation pump, and reconnect the water lines.
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