7-1.3 Disassembly. (Figure 7-4)
CAUTION
If prying off sections becomes necessary, take extreme care not to mar or
damage machined surfaces. Excessive force while prying can result in
misalignment and seriously damage parts.
If parts are stubborn during assembly, do not force them and never employ an
iron hammer.
Gears are closely matched, therefore they must be kept together as sets when
removed from a unit. Handle with care to avoid damage to the journals or teeth.
Never hammer roller bearings into bores. Use only an arbor press or other
suitable tool.
a. Mount the pump in a vise with the shaft end pointing down. Index mark all sections with a punch. Be sure to
align these marks when reassembling.
b. Remove the 4 hex nuts (1), studs (2) and washers (3) with a socket wrench.
c. Lift off the port end cover (4). If necessary to pry loose, refer to caution.
d. If the thrust plate (5) remains in the gear housing (6), it can be tapped out later with a wooden hammer handle.
Be careful not to distort the thrust plate.
e. Lift the gear housing (6) from the gears (7). Take care not to damage machined surfaces.
f. Carefully remove the drive and driven gears (7), not letting the teeth come into rough handling contact. Keep
these gears together because they are a matched set. Examine and replace if necessary.
g. Remove the drive gear connecting shaft (8).
h. Lift or pry off the bearing carrier (9) carefully to prevent damage to contact face and edges.
i. Lift or pry off the first section gear housing (10). Be careful not to damage machined surfaces. If the thrust plate
(11) remains in the gear housing, remove as described in step d.
j. Remove the integral gear and drive shaft set (12). Keep these together as they are a matched set. Examine
and replace if necessary. Be careful not to damage the machined surfaces of the gears.
7-4
