13
4.4
CHAIN INSPECTION AND MAINTENANCE
Inspect the chain before mounting and before each use.
1.
Ensure there are no missing segments or bumpers. There must be 49 segments with a bumper link between each segment.
2.
Ensure there are no signs of cracking, overheating, or other damage.
3.
Check the wear of the chain chassis, typically referred to as “chain stretch”, by tensioning the chain as described in Section
4.5. The chain chassis is considered worn out or excessively “stretched” if the chain cannot be tensioned sufficiently to
prevent the drive tangs from coming completely out of the groove. Discard the chain.
4.
Check the segment wear. The segment is considered worn-out when the height is worn down to about 1/16”, or when the
segment width is the same as the chain chassis.
After each use clean the slurry and debris off the chain; then apply a light coating of oil to prevent rusting.
4.5
CHAIN INSTALLATION AND TENSIONING
Refer to the Figure 7-1 assembly drawing in Chapter 7 throughout the following procedure.
WARNING:
FAILURE TO DISCONNECT THE POWER SUPPLY BEFORE STARTING CAN CAUSE
EQUIPMENT DAMAGE AND/OR PERSONAL INJURY.
1.
Ensure the hydraulic hoses to the saw are disconnected before starting.
2.
With the drive sprocket cover removed, back out the bar adjustment screw (#36) all the way by turning it counter-clockwise.
3.
Inspect the drive sprocket (#27) and the bar (#34) as described in sections 4.3 and 4.2 respectively.
4.
Install the chain by placing it around the drive sprocket making sure the bumpers lead the segments. Then, run the drive
tangs into the top groove of the bar (tang arrows pointing towards bar nose) and rotate it around the bar.
Backward
(reverse) chain installation can cause excessive vibration, rough cutting, reduced chain life, and chain breakage.
Make sure all drive link tangs are positioned inside the groove of the bar.
5.
Tighten the bar adjustment screw (#36) clockwise until chain is snug to the bar but still able to rotate around the bar. Chain
tension needs to be readjusted before the drive tangs can come completely out of the groove.
WARNING:
IF THE CHAIN IS TOO LOOSE DURING SAW OPERATION, THERE IS AN INCREASED
RISK OF CHAIN THROWING. A CHAIN THROW CAN CAUSE EQUIPMENT DAMAGE
AND/OR PERSONAL INJURY.
6.
Secure the drive sprocket cover assembly in place by tightening both flange nuts (#30).
WARNING:
NEVER OPERATE THE SAW WITHOUT THE DRIVE SPROCKET COVER INSTALLED.
FAILURE TO DO THIS CAN CAUSE SERIOUS PERSONAL INJURY.
