Operator`s manual

26
SECTION 7
MAINTENANCE INFORMATION
7.2.4 DRIVE CHAIN TAKE-UP SYSTEM
Figure 7-9. Installing the connecting link
Figure 7-7. Removal of the spring clip
Figure 7-8. Chain connection link components
Figure 7-10. Wear groove on the slider block
The chain tensioning system consists of a torsion spring
loaded cam assembly with a slider block which takes up the
slack on the bottom side of all but the front final drive chains.
As the chain wears, the chain tensioning mechanism adjusts
semi-automatically. Under most conditions, the tensioner
cam assembly will move to the next step of adjustment sim-
ply due to normal drive system dynamics. Sometimes, how-
ever, the cam assembly can bind due to debris caught in the
area. IT IS VERY IMPORTANT TO CHECK THAT THE
CAM ASSEMBLY IS PROGRESSING PROPERLY.
CHECK FOR PROPER CHAIN TENSIONER OPERATION
AFTER THE FIRST TWO HOURS OF USE AND THEN
EVERY 10 HOURS OF VEHICLE OPERATION, WHEN
THE DRIVE CHAINS ARE BEING LUBRICATED. Each
step of the cam takes up about 2.5 inches of chain slack (see
Fig. 7-11).
Check for proper chain tensioner operation every 10
hours of vehicle operation.
CAUTION
Figure 7-11. Chain slack required before the tensioner will
progress to the next step.
2.5”
measure at midpoint
between sprockets
The tensioner cannot progress to the next step until there is
enough slack in the chain. With the wheels raised off the
ground, check if the chain slack exceeds 2.5 inches. If it
does, then reach under the slider block assembly and pull up.