Power Takeoff (PTO) and Hydraulic Pump Maintenance Instructions (Cont)
HYDRAULIC PUMP REPAIR (M984E1) (CONT).
If shaft end pump or cover end pump is
suspected of failure, both pumps must be
disassembled and inspected or early failure of
pump may occur because of contamination or
There are two models of hydraulic
pumps. Model B has four additional
preformed packings, one seal ring,
different wear plate configuration
and different hardware. The Model B
pump is equal in size and functional
performance and fully
interchangeable with Model A pump.
Matchmark pump parts before
Position hydraulic pump inlet port
section (1) in soft-jaw vise.
Remove eight nuts (2), lockwashers (3),
and end cover (4).
Remove seal retainer (5) and seal
gland (6) from end cover (4).
(3.1) Remove preformed packing (6.1) from end cover (4).
(3.2) Remove seal ring (6.2).
Model B pump has a seal ring and preformed packing. Do steps (3.1) and (3.2) for
Remove retaining ring (7), shaft seal (8), and plug (9) from end cover (4).
Remove front wear plate (10).
19-18 Change 3