JLG 340AJ Service Manual - Manual (Page 235)

SECTION 5 - HYDRAULICS
3121259 – JLG Lift – 5-77
4. Remove front flange.
Place the pump on the table and slowly remove the
front flange.
Be careful not to damage the shaft seal when removing
the flange. Avoid contact of the shaft seal lips with key-
way edges (in tapered and parallel shafts) or splined
shaft teeth.
Inspect the front flange and seal area.
Clean with shop solvent, dry, and set aside.
5. Remove rear cover.
Clean with shop solvent, dry, and set aside.
Visually inspect rear cover and seal area.
6. Remove bearing blocks and gears.
Place the pump on its side and carefully remove the
bearing block and gear set. To accomplish this, hold the
pump body and push with your fingers on the rear bear-
ing block.
Mark the relative positions of the gear mesh (drive gear
tooth to idler gear tooth) and the bearing blocks to the
body so they can be reassembled in the same position.
7. Remove pressure seals.
Check the seal quality. Replacement is recommended
whenever there are burrs, evidence of extrusion, or
marks caused by overheating. If the seals need to be
replaced, carefully remove them from the flange cover,
beginning with the backup ring and then the pressure
seal.
IMPORTANT: DO NOT USE TOOLS WITH SHARP EDGES TO REMOVE THE SEALS,
AS DAMAGE TO THE COVER CAN RESULT.
After removal, dispose of damaged seals.