Disassembly (Fig. 28)
Plug pump ports and clean the outside of the pump
thoroughly. After cleaning, remove plugs and drain any
oil out of the pump.
1.
MARKER LINE
2.
front thrust plate, body and rear flange for assembly pur-
poses (Fig. 29).
Use a marker to make a diagonal line across the
IMPORTANT: Prevent damage when clamping the
gear pump in a vise; clamp on the front thrust plate
only. Also, use a vise with soft jaws.
3.
Clamp front thrust plate of pump in a vise with soft
jaws with the shaft end down.
Figure 29
4.
screws (item 23), washers (item 22) and cover (item 21)
from rear flange.
On HDX and HDX--D pumps, remove socket head
CAUTION
5.
flange to pump.
Loosen, but do not remove, screws that secure rear
Use eye protection such as goggles when using
compressed air.
6.
Remove pump from the vise and position pump so
that the shaft end is facing down. Remove screws.
2.
Clean all parts with solvent. Dry all parts with com-
pressed air.
7.
8.
move. Make sure the rear thrust plate remains on the
drive and idler gear shafts. Locate and retrieve dowel
pins.
Carefully lift rear flange from body.
3.
Inspect drive and idler shafts for the following (Fig.
Carefully remove body. Lift body straight up to re-
30):
A. Gear shafts should be free of rough surfaces and
excessive wear at bushing points and sealing areas.
Scoring, rough surfaces or wear on gear shafts indi-
cates need for replacement.
IMPORTANT: Note position of the open and closed
sideofthethrustplatesbeforeremoving.Also,iden-
tify thrust plates (front and rear) with a marker for
proper assembly.
B. Gear teeth should be free of excessive scoring
and wear. Any broken or nicked gear teeth must be
replaced.
9.
Carefully remove rear thrust plate, idler shaft, drive
shaft and front thrust plate from the front cover.
C. Inspect gear face edge for sharpness. Sharp
edges of gears will mill into wear plates and, thus,
must be replaced.
10.Remove
and discard O--rings, back--up seals and
pressure seals from pump.
4.
Inspect thrust plates for the following:
IMPORTANT: Make sure to not damage the seal
bores when removing the seal from the front cover
and rear flange.
A. Bearing areas should not have excessive wear or
scoring.
11.
both the front cover and rear flange (HDX and HDX--D).
Discard seals.
Carefully remove retaining ring and shaft seal from
B. Face ofthrust plates thatare incontact withgears
should be free of wear, roughness or scoring.
C. Thickness of thrust plates should be equal.
Inspection
5.
wear.
Inspect front cover and rear flange for damage or
1.
emery cloth.
Remove any nicks and burrs from all parts with
Workman HD Series
Page 9 -- 37
Hydraulic System
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