MBW AR57 - Manual (Page 11)

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Gearbox Removal
It is necessary to remove the handle and motor to remove
the gearbox.
Refer to Gearbox Assembly, page 14.
1. Remove the four socket head cap screws (#35) and
lockwashers (#21) securing the gearbox (#25) to the
guide tube (#17, page 16).
2. Compress the bellows enough to insert a small
wooden block between the gearbox (#25) and the
guide tube (#17, page 16).
3. Use the wooden block as a pivot point to separate the
gearbox (#25) from the guide tube (#17, page 16) to
expose the piston pin (#17).
4. Hold the gearbox (#25) and tap out the piston pin
(#17) with a hammer and drift pin. See Figure 1.
Gearbox Disassembly
NOTE: It is necessary to remove the gearbox before
disassembly.
Refer to Gearbox Assembly, page 14.
Cover Removal
1. Remove the six flange head screws (#32) securing
the cover (#23) to the gearbox (#25).
2. Install two of the screws from step 1 into the threaded
holes protected by the caps (#7). Turn them in to
back out the cover. If the cover should cock, a pry bar
may be used to bring the cover off straight. See
Figure 2.
3. Remove and discard the o-ring (#9).
Crank Gear Removal
1. Slip a retaining ring pliers through the slot in the
opening in the crank gear (#10) and remove the
retaining ring (#15). See Figure 3..
2. Remove the hex head cap screw (#34) and seal
washer (#16) from the cover.
3. Use a 3/8” (10mm) diameter steel rod to press the
crank gear out of the cover.
4. Remove the retaining ring (#1) from the crank gear.
5. Press the bearing (#4) off the crank gear.
6. Remove the small retaining ring (#14) from the crank
gear.
7. Remove the connecting rod (#8) from the crank gear.
8. Remove the retaining ring (#13) from the connecting
rod.
9. Press the bearing (#5) out of the connecting rod.
Figure 1
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Figure 2.

Figure 3.
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