(b)
Journals must be within 0.013 mm (0.0005") of each other. (See Figure 4-18).
(c)
Gear faces must be flat. This feature may be checked by blueing a bearing face and rotating against
gear this will also reveal any sharp edges on the teeth.
(d)
Replacement gears are supplied only as matched pairs.
4-6.4.3 Assembly.
a.
Place the flange (2, figure 4-16), machined surface down, on a clean flat surface. Apply a little grease to the oil
seal (17) and, with garter spring facing into pump, use a suitable tool to press seal into flange. Install retaining
ring (13).
b.
Install the backing rings (7), loading rings (16) and seals (15) in flange (2) and cover (3), using a little light grease
to aid their retention.
c.
Place the cover (3) in a soft jawed vise with machined face up. Be sure that dowels (14) are in place on body,
then assemble body (1) to cover, ensuring that inlet side of body is correctly positioned.
d.
Lightly lubricate the body bore, both faces and bore of bearings (6).
e.
Install the cover end bearing into the body bore with recessed face up and relieved radii towards pump outlet and
slide it gently to the bottom.
f.
Insert the gears (4 and 5) into their respective bores in pump body (1).
g.
Place the flange end bearing (6) over the gear shaft and slide it into location with the recessed face toward gears
and the relieved radii towards pump outlet.
h.
To avoid damaging seal (17), place a protective sleeve over the drive shaft and gently press the flange (2) down
onto the pump body (1).
i.
Install the screws (8 and 10) and install lockwashers (12) and nuts (11).
4-6.5 Displacement Pump. (Figure 4-19)
4-6.5.1 Disassembly.
CAUTION
The end cap screws should not be loosened until the shaft seal has been removed.
a.
Remove the large retaining ring (1) located on the shaft end of the pump. Remove the side opposite the tangs
from the groove first.
b.
The aluminum housing (2) is removed next. It is held in place by the friction of the O-ring (3) on its outside
diameter. Pry the housing toward the end of the shaft until the O-ring (3) is free.
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