McHale 991B Round Bale Wrapper
71
11.12.2 To decrease accumulator pressure
1. Remove the blanking cap on the hydraulic cylinder
2. Insert a small punch into the hydraulic cylinder port. There is a one way ball
valve in the cylinder which the punch needs to unseat to release oil. Always
cover the punch with a cloth to prevent oil contacting skin.
3. Replace the blanking cap and test the cut and hold to ensure it is opening and
closing correctly.
Figure 11.q - Decrease accumulator pressure
11.13 Chain adjustments
It is important for the efficient operation of the machine that all drive chains are kept
correctly tensioned. The following is a general guide to chain adjustment.
The sag is measured at the midpoint of the chain between the sprockets. Always
ensure one side of the chain is tight so that the correct reading is obtained. Even though
some drives differ in detail the basic adjustments stay the same.
Figure 11.r - Chain adjustments
11.13.1 Table drive chain
After a period of time, it may become necessary to readjust the drive chain.
To adjust go through the following procedure:
1. Tip up the wrapper table and fit the safety bar securely
2. Stop the tractor/power unit and ensure that it cannot be restarted, while
working on the machine.
3. Loosen the 4 x M16 bolts holding on the motor plate
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