MBW GPR77 - Manual (Page 14)

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19. Use a 1/4” pin punch at least 2” long through the
access holes to press the bearings shafts out of the
housing.
CAUTION
Alternate between the two access holes evenly to
prevent damage to the housing and bearings dur-
ing removal. Have an assistant hold the bearings
during removal to prevent dropping them.
20. Remove the oil seal (item #7) from the exciter cover.
21. Remove the breather pin (item #29), felt filter (item
#2), and the retaining ring (item #3) from the cover.
22. Remove all four small retaining rings (item #9) from
the shafts.
23. Press the bearings (items #6 and #8) off of both ends
of each shaft.
24. Clean the shafts and remove both gears and the key
(items #4 #15 and #16).
25. Press the bearing (item #18) out of the gear (item
#16).
26. Clean and inspect the bearings, housing, cover,
gears and shafts. Replace parts as needed.
NOTE: Bearings, gears and exciter weights should be
replaced as complete sets.
Actuator Disassembly
Refer to Actuator Assembly, page 16.
1. Remove the cotter pin (item #11).
2. Unscrew the castle nut (item #12) halfway.
3. Tap the top of the castle nut and actuator shaft (item
#8) to release the taper lock.
4. Remove the castle nut.
5. Remove the actuator shaft (item #8) from the
assembly.
6. Remove the key (item #1), belleville washer (item
#2), and the thrust bearing (item #9). from the
actuator.
7. Remove the washer (item #13) and actuator arm
(item #7).
8. Remove the o-ring (item #3) and actuator bushing
(item #6).
9. Remove the last two o-rings and the spiral pin (item
#10).
10. Clean and inspect all parts.
Shifter Disassembly
Refer to Shifter Assembly, page 18.
1. Slide the shaft (item #4) out of the shifting yoke (item
#1).
2. Tip the yoke and catch the detent balls (item #2)
when they fall out.
3. Drive the spiral pins (item #5) out with a small punch.
4. Remove the springs (item #3).
5. Clean and inspect all parts.
Shifter Assembly
Refer to Shifter Assembly, page 18.
1. Insert the shaft (item #4) into the shifting yoke (item
#1). Position the hole in the shaft the same way as
shown in the illustration.
2. Insert both detent balls (item #2) into the shifting
yoke.
3. Insert the springs (item #3) into the shifting yoke
behind each detent ball.
4. Compress the springs and insert the spiral pins (item
#5).
Actuator Assembly
Refer to Actuator Assembly, page 16.
1. Install the (2) o-rings (items #4 and #3) onto the
actuator cover (item #5).
2. Assemble the thrust bearing (item #9), belleville
washer (item #2), and the key (item #1) onto the
actuator shaft (item #8). NOTE: Belleville washer to
be installed with the cupped face up!
3. Insert the actuator into the cover.
4. Assemble the actuator bushing (item #6) onto the
actuator through the top of the cover.
5. Assemble the o-ring (item #3) onto the bushing.
6. Assemble the actuator arm (item #7) and the spiral
pin (item #10) to the bushing. NOTE: Orientation of
the arm is important! Use the figure as an installation
guide.
7. Apply a bead of silicone sealant to the actuator arm
around the actuator.
8. Assemble the washer (item #13) and castle nut (item
#12) to the actuator.
9. Tighten the castle nut and install the cotter pin (item
#11).