Owner's manual

- 9 -
SERVICE
Assembly and disassembly should be performed by a
service technician who has been factory trained on MBW
equipment. The unit should be clean and free of debris.
Pressure washing before disassembly is recommended.
• Prior to assembly, wash all parts in a suitable cleaner or
solvent.
• Check moving parts for wear and failure. Refer to the
Replacement section in this manual for tolerance and
replacement cycles.
• All shafts and housings should be oiled prior to pressing
bearings. Also, ensure that the bearings are pressed
square and are seated properly.
• All bearings, seals, o-rings and gaskets should be
replaced when rebuilding gearbox.
Torque Chart
Service Tools
Gearbox Disassembly
Refer to Gearbox Assembly, page 14.
1. Remove the handle, belt guard & drive assembly
(page 18), engine & guard ring (page 20).
2. Loosen the square head set screw (page 16, #20)
until the gearbox housing can be lifted off the spider
assembly.
3. Flip the gearbox housing (#7) over and set it on the
four guard ring pads.
4. Remove the yoke arm (#9) by removing one of the
retaining rings (#6), holding the pivot rod (#12) and
sliding the rod out of the holes.
5. Remove the two flange bolts (#24) and the two flat
head screws (#25) that hold the cover (#8) to the
gearbox housing (#7).
6. Remove the cover and discard the shims (#11) and
the o-ring (#5).
7. Pull out the shaft (#14) with the bearings (#3) and the
worm gear (#13) and drain oil out of gearbox.
8. Press bearing (#3) and worm gear (#13) off long side
of shaft (#14).
9. Remove key (#15) and retaining ring (#2) from shaft.
10. Press remaining bearing (#3) off of shaft.
11. Remove the four flange bolts (#23) and the bearing
cap (#20). Discard the shim gasket (#10) and the
o-ring (#17).
12. Remove the worm shaft (#19) and the bearings (#22).
13. Remove the retaining cap (#21) and discard the shim
gasket (#10) and the o-ring (#17).
Gearbox Assembly
Refer to Gearbox Assembly, page 14.
1. Lightly oil the shaft (#14). Install the key (#15) and
the retaining ring (#2) onto the shaft.
2. With the retaining ring end of the shaft down, press
the worm gear (#13) onto the shaft. Make sure the
SIZE GRADE 2 GRADE 5 GRADE 8
1/4-20 49 in
•lbs 76 in•lbs 9 ft•lbs
1/4-28 56 in
•lbs 87 in•lbs 10 ft•lbs
5/16-18 8 ft
•lbs 13 ft•lbs 18 ft•lbs
5/16-24 9 ft
•lbs 14 ft•lbs 20 ft•lbs
3/8-16 15 ft
•lbs 23 ft•lbs 33 ft•lbs
3/8-24 17 ft
•lbs 26 ft•lbs 37 ft•lbs
7/16-14 24 ft
•lbs 37 ft•lbs 52 ft•lbs
7/16-20 27 ft
•lbs 41 ft•lbs 58 ft•lbs
1/2-13 37 ft
•lbs 57 ft•lbs 80 ft•lbs
1/2-20 41 ft
•lbs 64 ft•lbs 90 ft•lbs
9/16-12 53 ft
•lbs 82 ft•lbs 115 ft•lbs
5/8-11 73 ft
•lbs 112 ft•lbs 159 ft•lbs
5/8-18 83 ft
•lbs 112 ft•lbs 180 ft•lbs
3/4-16 144 ft
•lbs 200 ft•lbs 315 ft•lbs
1-8 188 ft
•lbs 483 ft•lbs 682 ft•lbs
1-14 210 ft
•lbs 541 ft•lbs 764 ft•lbs
1-1/2-6 652 ft
•lbs 1462 ft•lbs 2371 ft•lbs
M 6 3 ft
•lbs 4 ft•lbs 7 ft•lbs
M 8 6 ft
•lbs 10 ft•lbs 18 ft•lbs
M 10 10 ft
•lbs 20 ft•lbs 30 ft•lbs
CONVERSIONS
in
•lbs x 0.083 = ft•lbs
ft
•lbs x 12 = in•lbs
ft
•lbs x 0.1383 = kg•m
ft
•lbs x 1.3558 = N•m
Part No. Description
07276 Adjustment Tool, Tilt Arm Parallelism
07277 Adjustment Tool, Tilt Arm Height Gage
07279 Installation Tool, Spider Bushing (#06459)
16421 Bearing Spool Tool (Constant Force)