425HD-MD INITIAL SETUP
Gearbox Belts
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3-12 425HD-MD/masterdoc101602 425HD-MD INITIAL SETUP
3.14 Gearbox Belts
The gearbox drive belts are located under the operator seat pan, between the electric
clutch (in front of the engine main drive pulley) and the gearbox (below the engine main
drive pulley).
3.15 Gearbox Alignment
It is important that the gearbox pulleys are correctly aligned. If the pulleys are not aligned,
it will result in pre-tensioning and premature belt alignment.
To check the alignment of the gearbox pulley, use a straight edge. The front face of the
clutch pulley should align with the front face of the gearbox pulley.
Since the land of the "V" grove on the gearbox pulley is wider than the on the clutch pulley
the straight edge will align to the mid point of the land on the gearbox pulley.
If the pulley alignment is not correct, then loosen the gearbox pulley and reposition it so
that 7/16" of the gearbox shaft protrudes from the pulley.
Snug up the three bolts (do not tighten), position gearbox and check that the face of both
pulleys are aligned. Then tighten the hub bolts 1/2 a turn in sequence till all are tight (100
in-lb torque) and check again.
When the pulley hub is tightened it will normally pull the pulley backwards resulting in the
correct align Now add the two shims to raise the gearbox by 1/16" and reassemble.
Gearbox shims must be added if alignment was correct.
NEVER inspect, adjust, or change the gearbox belt while the engine is
running!
Gearbox Drive Belt Tension Is PRESET. Increasing The Spring
Tension Could Cause Serious Damage.
Improper gearbox belt tension can cause serious damage to the
Engine!
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