Graco GM 3500 - Repairing the Pinion; Pinion Assembly Steps



Pinion Housing
Fig. 21
19g
Detail A
19k
19a
19m
19e
19f
19d
19b
19c
Lubricate inner and
outer diameters
Lubricate teeth
Lubricate exterior
19h
19j
19n
19s
Directional
arrow on roller
clutch must
face the small
bearing (19c)
0042
1
3
4
2
1
2
3
1
4
4
5
6
Press fit small
bearing (19c)
and clutch roller
(s) here
Back is shown
5
6
Repairing the Pinion
NOTE: Use a hydraulic press if you purchase the pin -
ion parts individually . Otherwise, use Repair Kit No.
223–189, which includes the shaft and bearings pre–
assembled and lubricated.
NOTE: Refer to Fig. 21 except where noted.
If using Repair Kit 223–189 , follow Steps 1 to 6, below .
1. Remove the small ring (19e) from the hub (19f)
and the large ring (19k) from the bearing recess of
the housing (19n).
2. Push on the front of the shaft (19b) to force the
bearing and hub assembly out of the housing
(19n).
3.
Press the small bearing (19c) out of the pinion
housing (19n). Remove the new bearing from the
shaft of the kit and press it into the housing. See
Detail A.
4. Install the shaft assembly (19a), pushing it to the
shoulder of the housing (19n).
5. Install the rings (19e and 19k).
6. Go to Reassembly , page 29, Step 7, or continue
on page 24.
If you purchased parts separately , follow steps 1 to
9, below . Disassemble only as far as needed for the
parts being replaced.
NOTE: The old bearing (19d) will be damaged as it is
removed. Have one on hand if you need to remove it
for any reason.
1. If replacing the small bearing (19c) or roller clutch
(19s), press the old ones out of the pinion housing
(19n).
2.
Remove the small ring (19e) from the hub (19f).
Remove the snap ring (19k) from the bearing re -
cess of the housing (19n).
KEY
A Round
steel bar to
push on shaft (19b)
B Hydraulic press
C Steel bar stock
DT wo steel blocks
E Press platform
Fig. 22
É
É
É
É
É
É
É
É
01427
19d
19f
A
B
C
D
E
3.
Push on the front of the shaft (19b) to force the
bearing and hub assembly out of the housing
(19n).
4.
Using a hydraulic press, place pieces of steel
bar stock on the inner race of the large bearing
(19d) and press the shaft through the hub and
bearing. See Fig. 22.
5. Apply lubricant to the parts as shown in Fig. 21.
6. Press fit the following parts:
 Small bearing (19c) and then the roller clutch
(19s), with the directional arrow facing the
samll bearing , into the rear of the housing
(19n). See Detail A in Fig. 21.
 Large bearing (19d) to shoulder of the shaft
(19b).

Hub (19f) onto the shaft (19b) all the way to
the large bearing (19d).
7. Install the shaft assembly (19a), pushing it to the
shoulder of the housing (19n).
8. Install the rings (19e and 19k).
9. Skip ahead to Reassembly , page 29, Step 7, or
continue on page 24.