MBW F46/4 - Manual (Page 12)

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S
ERVICE
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)