JLG 510AJ Service Manual - Manual (Page 258)

SECTION 5 - HYDRAULICS AND HYDRAULIC SCHEMATICS
5-38 – JLG Lift – 3121181
5.3 HYDRAULIC PUMP (GEAR)
Disassembly
NOTE: The following general instructions also apply to multiple
section gear pumps, the only extra parts are the coupling
between the drive shafts and the center distance plate
which divides the two pump sections. This repair procedure
also applies to the "W" series Gear Motors.
1. It is very important to work in a clean work area when
repairing hydraulic products. Plug ports and wash exte-
rior of pump with a proper cleaning solvent before con-
tinuing.
2. Remove port plugs and drain oil from pump.
3. Use a permanent marker pen to mark a line across the
mounting flange, gear housing and end cover. This will
assure proper reassembly and rotation of pump.
4. Remove key from drive shaft if applicable.
5. Clamp the mounting flange in a protected jaw vise with
the pump shaft facing down.
6. Loosen the four metric hex head bolts.
7. Remove pump from vise and place on clean work bench,
remove the four hex head bolts and spacers if applica-
ble.
8. Lift and remove end cover.
9. Carefully remove gear housing and place on work
bench. Make sure the rear bearing block remains on the
drive and idler shafts.