Hydro System Adjustment - Stanley 54ZS Owner's Manual

54ZS, 6 2ZS
Hydro System Adjustment
The hydrostatic drives are coupled to the output drives with a multi-v belt. Occasional re-tensioning of the belt may
be necessary. If performance decreases or hydro 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.
1. Adjust the hydro 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 101bsof 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 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 the hydro adjustment bolt a half turn on each side at the same time.
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 loosen the bolt
(turn counter-clockwise) half of a rotation, so the mark is now on the other
side. This will set tension so the belt does not squeal, and provides ample
torque for driving and mowing without causing belt or hydro damage.
Now drive the mower on a grassy surface. Perform several Zero Turns. Drive the unit aggressively. If the perform-
ance is "sloppy" or you have excessive belt chirping, tighten the bolt 1/6th of a rotation and re-test. Re-Install the
hydro 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.
Rev:JUN2011 STANLEY Finish Mower 23