JLG 450A_AJ Series II Service Manual - Manual (Page 319)

SECTION 5 - HYDRAULICS
3121180 – JLG Lift – 5-29
General Information
FAILURE TO PROPERLY ASSEMBLE THIS PUMP WILL RESULT
WITH LITTLE OR NO FLOW AT RATED PRESSURE. RELATIONSHIP
OF MOUNTING FLANGE, BEARING BLOCKS, AND GEAR HOUSING
MUST BE CORRECT.
Reverse Shaft Rotation of Pump
NOTE: Pump is not bi-rotational. Use the following proce-
dure if shaft rotation direction is changed.
Reverse shaft rotation of the ”W” series gear pump by
rotating, as a group, two bearing blocks and gear housing
180° in relationship to remaining parts of pump. This
places pressure port on opposite side of pump from its
original position.
Assembly
NOTE: Install new seals when reassembling pump or motor.
Go to page 8 for kit part numbers for W-600, W-900,
and W-1500 pumps and motors.
1. Install new shaft seal in mounting flange with part
lumber side facing outboard. Press seal into seal
bore until seal reaches the bottom of bore. Uniform
pressure must be used to prevent seal misalignment
or damage.
2. Install retaining ring in groove in seal bore of mount-
ing flange.
3. Place front and back bearing blocks on a clean sur-
face with E-seal grooves facing up. Apply a light
coating of petroleum jelly in the grooves. Coat E-
seal and backup with petroleum jelly. This helps
keep seals in place during reassembly.
4. Place E-seals, flat side outward, into grooves in both
bearing blocks. Carefully place backup ring, flat side
outward, in groove made by E-seal and groove in
bearing block. (Note: W900 series pump - In center
of backup ring and E-seal there is a notch. Make sure
notches line up so backup ring will set flush with E-
seal). Backup ring in W1500 pump is symmetrical.
5. Place mounting flange, with shaft seal side down, on
a clean flat surface.