Hydraulic Drive System Adjustment - Z-BEAST 54ZB Owner's Manual

Z - BEAST
Service Adjustments
54ZB, 62ZB

Hydraulic Drive System Adjustment

The hydraulic drives are coupled to the final drives with a multi-v belt. Occasional re-tensioning of the belt may be
necessary. If performance decreases or hydraulic drive control handles are activated and the wheels do not turn,
inspect the multi-v belt. Before beginning the following test, read all warnings in this manual. If you are
uncomfortable with this procedure please contact GXi to be set up for service.
Normal service interval: seasonally or every 100 hrs.
Adjust the hydraulic drive adjustment bolts by tightening the two large 21mm nuts on the rear of the mower. Tighten
the final drive belt so there is approximately 3/4" belt deflection in the center of the belt with about 10lbs of pressure
applied.
The next step is to perform a "wall test." Drive the mower against a padded
stationary object. For accurate results, a smooth brushed concrete surface
works best. Stand next to the mower with one hand on the seat. Start the
mower with one hand on the seat to engage the safety switch. Engage the
left side handle into the drive position. Quickly move the handle to full
forward position for about half a second. Now perform the same procedure
on the right side. If the belt squeals and the wheel does not spin on either
side, tighten each adjustment bolt one half turn. Always turn both bolts the
same amount whenever adjustment is required. Repeat the test until both
tires will break traction and spin.
Once you have the tension set so each wheel will just barely break traction,
mark the bolt on one side of the hex head as shown. Now tighten the bolt
(turn clockwise) one sixth of a turn. This will set tension so the belt does not
squeal, and provides ample torque for driving and mowing without causing
belt or hydraulic drive damage.
Now drive the mower on a grassy surface. Perform several Zero Turns. Drive the unit aggressively. If the
performance is "sloppy" or you have excessive belt chirping, tighten the bolt 1/6th of a rotation and re-test.
Re-Install the adjustment bolt retainer clips after adjustments.
If the mower is too nimble, or you want to reduce the power output to prevent damage to the turf, loosen the bolt
1/6th of a rotation and re-test. Occasional belt chirping is permitted. If the belt squeals excessively tighten 1/6th of a
rotation and re-test.
Z- Beast Finish Mower 25
Rev: AUG2014