DRIVE SYSTEM ADJUSTMENTS:
Due to both the complex nature of the transmission and the number of special tools
required for service, adjustments should be entrusted to your dealer.
There are a number of simple owner service items which greatly influence the
performance of the drive system.
1. Front and rear tires must be inflated to proper specifications.
2. Rear drive chain tension.
3. Tightness of all controls and linkages pertaining to the drive levers.
4. Lubrication of both primary and final drive-chains. The use of a high quality chain
lubricant is highly recommended.
REAR CHAIN ADJUSTMENT:
To adjust the rear drive chains on the Model ZTR 4421, tighten the nut on top of the
spring on each side of the mower chassis until the coils of the spring are almost fully
closed. At this point the chains should have approximately 1/4" movement up and down
when measured at a mid point.
Check to assure that the drive chains are properly adjusted. A loose chain may
come off
causing loss of control.
Page 28