Specifications

7500 SERVICING BEARINGS

Replacing Jackshaft Bearings

• Line the jackshaft pulley up with the engine

pulley using a straight edge.

• When the pulleys are aligned, tighten the screws

in the jackshaft pulley. Recheck the alignment

to be sure nothing changed. Torque the screws

in the jackshaft pulley to 30 ft. lbs

• Once the sprockets are lined up, tighten Poly

Chain® belt by adjusting jam bolts on the

jackshaft bearings. Remember at this point

everything is lined up, so when you adjust one

bearing forward, adjust the other bearing the

same amount.

• Make only slight adjustments at a time and

recheck tension; repeat as necessary until

tension is correct. Then once the belt is

adjusted, retighten the bolts on the other side of

the bearings. Recheck belt alignment after

tightening all bolts and nuts to make sure the

belt is sill aligned.

• DO NOT OVER TIGHTEN BELT; OVERLY

TIGHT BELTS WILL CAUSE BEARING

AND ENGINE DAMAGE. To loosen the

tension on a belt, loosen the jam bolts and

tighten the bolts on the other side of the bearing.

Always make slight adjustments and recheck

tension. Also make equal adjustments on both

bearings.

• Replace belts when worn or when repeated

adjustments are necessary. Belts should never

get so loose that all of the adjustment capability

is used.

• Tighten bearings down and recheck Poly

Chain® sprocket alignment and tension. Use

two wrenches to tighten the bolts in the bearings

as shown in the picture to the right.