Graco B Series Instructions-Parts List Manual page 19

A
19k
73
20b
20a
20c
41,70
1
23
48,49
21
Torque to
1
25 ft–lb
(34 N.m)
1f
Fig. 16
WARNING
To reduce the risk of a serious injury due to the
sprayer starting unexpectedly, always shut off the
engine and disconnect the spark plug before
performing any checks or service.
Drive Housing
19p
70,71
20
86
01787
1. Disconnect the siphon hose elbow (1f), drain hose
(86) and material hose (not shown). Disconnect
the pump outlet hose. Disconnect the pressure
control cord (62). Remove the front cover (21).
2. Remove the four screws (48) and lockwashers
(49) from the bearing housing (23).
3. Lightly tap the back of the bearing housing (23)
with a plastic mallet. Pull the pump, bearing hous-
ing and connecting rod away from the drive hous-
ing (20) as one assembly.
4. Remove the bearing housing screws (41) and the
pinion housing screws (3).
CAUTION
DO NOT drop the gear cluster (1) when removing
the drive housing (20). The gear cluster is easily
damaged. The gear may stay engaged in either the
drive housing or the pinion housing.
DO NOT lose the thrust balls (20c and 19k) lo-
cated at each end of the gear cluster. The balls,
which are heavily covered with grease, usually stay
in the shaft recesses, but they could be dislodged.
If they are caught between the gears and not
removed, the balls will seriously damage the drive
housing. If the balls are not in place, the bearings
will wear prematurely.
5. Lightly tap around the drive housing (20) with a
plastic mallet to loosen it from the pinion housing
(19p).
6. Liberally apply bearing grease (20d, supplied) to
the gear cluster (73). Be sure the thrust balls (20c
and 19k) are in place.
7. Place the bronze colored washer (20a) and then
the silver-colored washer (20b) on the shaft pro-
truding from the big bearing of the drive housing
(20). Align the gears and push the new drive
housing straight onto the pinion housing and
locating pins (A).
8. Reassemble the sprayer. Or, go to the next section
in this manual if further service is needed.
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