FOR MODELS: JGW, JGR AND JGJ SECTION 5 - MAINTENANCE
1/01 PAGE 5 - 13
Replacement of any parts that can change the position of the drive sprocket on the crank-
shaft (i.e. crankshaft, drive sprocket, thrust plates), and/or loss of the as built sprocket posi-
tion of driven components, can require repositioning the lube oil pump and force feed
lubricator sprockets. Center crankshaft in end play. With a good straight edge, check to see
that sprockets are aligned within 1/32 inch (1mm). Or measure the distance between the
inside face of the auxiliary end cover to the near faces of the drive sprockets on the crank-
shaft with a good machinist rule. Check the driven sprockets in the chain drive system
against the measured dimensions at crankshaft drive sprockets. Adjust the driven sprockets
to the drive sprocket measurements to be aligned within 1/32 inch (1mm).
Chain Adjustment
1. Roll machine to the tightest position of the chain. This prevents snugging up on
the chain at a slack position and breaking rollers or ruining the pump and lubri-
cator bearings when the chain goes through its tightest position.
2. Remove the two capscrews and eight plugs from the eccentric adjustment cap.
Rotate the cap 6 degrees clockwise facing cap from outside to line up two new
capscrew holes. If this makes the chain too tight, try turning the cap around in a
counterclockwise direction for a different hole lineup.
3. Tighten the two capscrews to the recommended torque shown in Table 1-11 on
page 1-15, and roll the machine to check the tightness in a number of positions.
At its tightest position, the chain should be adjusted so that the deflection of the
most accessible span is within the chain deflection limits shown in Table 5-2.
This deflection can be measured from a straight edge held on the chain wrapped
over the two sprockets. The allowable deflection is measured at the center of the
span, while a force of 2 to 10 lb (9 to 45 N) finger pressure is applied to chain.
FIGURE 5-7: CHAIN DRIVE SYSTEM - TYPICAL
Plastic Dust
Plug
Eccentric
Adjustment
Chain
Force Feed
Lubricator
inspection
Plug
Crankshaft
Sprocket
Lube Oil
Pump
Optional
Crankcase
Oil Level
Regulator
Crankcase Oil Level
Sight Gauge
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