Operator`s manual

SECTION 7

MAINTENANCE INFORMATION

Figure 7-7. Removal of the spring clip

Figure 7-8. Chain connection link components

7.2.4 DRIVE CHAIN TAKE-UP SYSTEM

Figure 7-9. Installing the connecting link

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 simply due

to normal drive system dynamics. Sometimes, however, the

cam assembly can bind due to debris caught in the area. IT IS

VERY IMPORTANT TO CHECK THAT THE CAM ASSEM-

BLY 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 LU-

BRICATED. Each step of the cam takes up about 2.5 inches of

chain slack (see Fig. 7-11).

Figure 7-11. Chain slack required before the tensioner will

progress to the next step.

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.

Check for proper chain tensioner operation every 10

hours of vehicle operation.