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Section V
Main tenance
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GEARBOX A10A1
WOOD BLOCK (SEE TEXT)
Model 7754A/7414A
Figure 5-17. Drive Chain Removal
listen for chattering of clutch springs, which indicates either
a need for lubrication or replacement of the clutch spring
or replacement of a gear if the gear hub is worn. Parts that
are obviously faulty, such as a twisted spring jamming the
gearbox, should be replaced during overhaul.
5-51. GEARBOX DISASSEMBLY. Use the following pro-
cedure to disassemble the gearbox, and to inspect for clutch
wear.
a.
Remove four screws holding the motor chassis and
drive motor (Figure 5-18).
b.
Tip the chassis, toward the drive motor as shown in
Figure 5-19, removing the chain, cover, and motor as a unit.
c.
Turn the gearbox upside down and remove eight
screws holding the bottom cover and solenoids.
d.
Remove the bottom cover by lifting it upward
(Figure 5-19).
5-28
OTE: If gears are to be replaced or components lubri-
cated remove only one shaft at a time to preserve the order
of the gears on the shaft for best wear characteristics.
e.
Remove one screw holding the primary shaft to the
end plate, and pull out the shaft by the large output gear
(Figure 5-20). Lift the entire primary gear train out as one
unit. Note the orientation and position of each component.
f.
Remove the parts from the gear train one at a time,
and clean each part by brushing it with Chlorothene
solvent. Wipe plastic clutch sleeves with Chlorothene-
dampened cloth.
CAUTION
ALWAYS BRUSH NON-PLASTIC PARTS; NEVER
IMMERSE THEM IN SOLVENT. DO NOT WASH PLAS-
TIC CLUTCH SLEEVES WITH SOLVENT.
g.
Inspect each part for damage and wear before lubri-
cation. To check for hub wear, drag a fingernail across hub
surface and check for grooves.
07754-1
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