Hydraulic Pump (Gear); Disassembly - JLG 600AJ Service And Maintenance Manual

SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS

5.6 HYDRAULIC PUMP (GEAR)

Disassembly

NOTE: The following general instructions also apply to multiple
section gear pumps. The only extra parts are the coupling
between drive shafts and center distance plate which
divides the two pump sections. This repair procedure also
applies to "W" series Gear Motors.
1. Always work in a clean work area when repairing
hydraulic products. Plug ports and wash exterior of
pump with approved cleaning solvent.
2. Remove port plugs and drain oil from pump.
3. Use a permanent marker pen to mark a line across
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 mounting flange in a protected jaw vise with
pump shaft facing down.
6. Loosen four metric hex head bolts.
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7. Remove pump from vise and place on clean work bench.
Remove four hex head bolts and spacers if applicable.
8. Lift and remove end cover.
9. Carefully remove gear housing and place on work
bench. Make sure rear bearing block remains on drive
and idler shafts.
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