Simplicity ZT4000 Series - Manual (Page 36)

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Regular Maintenance
Figure 37. Rear Suspension Adjustments
Rear Suspension Adjustment
The shock assembly can be adjusted to allow the operator
to customize the ride according to operator’s weight and/or
operating conditions. You have the option of adjusting the
spring pre-load.
Items to consider before adjusting the suspension.
• Less spring pre-load should be used with light weight
operators, which will provide a softer, more cushioned
ride.
• More spring pre-load should be used with heavy weight
operators, or when a rear-mount grass bagger system is
installed, which will provide a stiffer, more rigid ride.
To adjust the spring pre-load:
1. Park machine on a flat, level surface. Disengage the
PTO, stop the engine and engage the parking brake.
2. Raise the rear of the machine and secure with
jackstands. Chock the front wheels to prevent the
machine from rolling.
3. Remove the rear drive tires.
4. See Figure 37. Using the supplied spanner wrench (p/n
5022853), insert the tip of the wrench into the notch in
the pre-load adjuster. While holding the wrench in place
with one hand, turn COUNTER-CLOCKWISE to increase
the pre-load, turn CLOCKWISE to decrease the pre-load.
Make sure both shocks are set to the same amount of
pre-load.
5. Reinstall the rear drive tires. Torque the lug bolts to
85-95 ft/lbs. (115-129 Nm). Remove the jackstands
from under the machine.
NOTE: Spanner wrench is located under the seat on the
right-hand side of the machine.
NOTE: It is recommended that the rear suspension be
adjusted stiffer due to the added weight of the collection
system.
WARNING
Spring loaded components can kick back
causing injury.
Use two hands when adjusting the shock assemblies. This
will prevent the wrench from slipping while pressure is
being applied.
SPANNER
WRENCH