Thomas 85 - Drive Chain 3.3

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3-4
DRIVE CHAIN 3.3
Checking The Drive Chain
The drive chain must be checked for adjustment after the
first 50 hours of service and every 150 hours thereafter.
Correct chain tension must be set to 1/4 to 3/8 inches (6
to 9mm) free play.
1 Remove any attachment, raise the boom arms and
engage the boom support pins. Shut off the engine. Using
properly rated jack and stands, raise loader until wheels
are clear of the ground.
2 Remove the inspection cover located between the
wheels. (fig. C5078)
3 Check the chain tension at the points shown.
(Fig. C5074)
5 Chains should be measured visually with a tape mea-
sure.(Fig.C5061) Push down on chain with one finger,
note tape measure reading at top of chain. Lift up on
chain with one finger, note tape measure reading at top of
chain. The difference is the amount of slack in the chain.
This should not exceed 2 in. (50mm) (Fig.C2425)
Measure all 4 chains ( 2 in each side).
C5078
C5074
C2425
C5061
Remove inspection cover
Measure chain tension here
Not exactly as shown
2” max
(50mm)
6 Install gasket seal, cover and nuts. Do not
over-tighten nuts, 15 ft/lb maximum.
7 Re-install wheels and nuts. Torque nuts to 100-
110ft/lb. Lower loader to the ground.