Ferris ISX3300BVE37CE Operator's Manual page 30

The rear shock assemblies can be adjusted by changing the
spring's pre-load and/or upper mounting position.
A spanner wrench (B) was included with the literature packet
that came with this unit. The spanner wrench is used to adjust
the spring's 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
operator's, which will provide a stiffer, more rigid ride.
• There are three positions in which the upper shock
mount can be positioned to. If adjusting the spring's pre-
load does not achieve the ride requirement, the shock
should be moved to the next higher numbered upper
shock mounting position to achieve the desired ride
requirement.
• Before adjusting the upper shock mount to a higher
numbered position you should attempt to achieve the ride
height through the spring's pre-load adjustment.
• Shock mounting position #3 should always be used when
a rear mounted grass collection system is installed on the
unit.
To Adjust the Spring Pre-load:
This procedure details the process for adjusting the spring's
pre-load for the rear shocks. To adjust the spring's pre-load
for the front shocks only steps #1 and #5 are required.
The shock's pre-load adjustment consists of rotating the pre-
load adjuster (A, Figure 40) with a spanner wrench so that the
adjuster rides either up or down on the shock's fixed point (B)
into one of the adjuster's five notch positions. As the adjuster
moves up towards the spring, the spring is more compressed
which creates more spring load. As the adjuster moves down
away from the spring, the spring is less compressed creating
less spring pre-load.
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1. Park the unit on a flat, level surface such as a concrete
floor. Disengage the PTO, engage the parking brake, and
turn the ignition switch to OFF to stop the engine.
2. Chock the front wheels to prevent the unit from rolling.
3. Raise the rear of the unit and secure with jack stands.
4. Remove the rear drive tires.
WARNING
Spring loaded components can kick back causing injury.
Use two hands when adjusting the shock springs with the
spanner wrench. This will prevent the wrench from slipping
while pressure is being applied.
5. Using the supplied spanner wrench (B, Figure 39),
insert the tip of the wrench into the adjustment notch (C,
Figure 40) in the pre-load adjuster (A). While holding the
wrench in place with one hand:
• Turn the pre-load adjuster so that it moves up
towards the spring, compressing it, to increase the
springs's pre-load;
• Turn the pre-load adjuster so that it moves down
away from the spring, decompressing it, to decrease
the spring's pre-load.
Note: If necessary, a replacement spanner wrench can be
ordered through your normal parts source.
6. Re-install the rear drive tires. Torque the lug bolts to
85-95 ft.lbs. (115-129 Nm). Remove the jack stands from
under the machine.
Note: If a collection system is installed on the unit it is
recommended that the rear suspension be adjusted stiffer
due to the added weight of the collection system.
To Adjust the Upper Mounting Position (Rear
Shocks):
1. Park the unit on a flat, level surface such as a concrete
floor. Disengage the PTO, engage the parking brake, and
turn the ignition switch to OFF to stop the engine.
2. Chock the front wheels to prevent the machine from
rolling. Raise the rear of the machine and secure with
jack stands. The jack stands must be under the bumper
of the machine.
3. Position the jack underneath the rear cross member
of the transmission cradle and slowly raise the rear
suspension to relieve the pressure on the upper shock
mounting bolts.
Note: This will require small adjustments to the jack's position.
The shock should move freely on the mounting bolt when the
pressure is relieved.
4. Remove the upper shock mounting hardware and pivot
the shock to the next higher numbered position (see
Figure 39). Adjust the jack to align the shock mounts to
shocks.
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