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Section 3: Adjustments
ZT60i & ZT72i (S/N 748110+) Accu-Z
®
Zero Turn Mowers 357-552M
Table of Contents
2/06/14
Belt Tensioning
There are two drive belts on the ZTi mower. The ground
drive belt is the upper belt that powers the mower
’s rear
wheels (see Figure 3-7). The deck drive belt is the lower
belt that powers the mower deck blades (see Figure 3-9).
Ground Drive Belt Tensioning
Refer to Figure 3-7:
The ground drive belt (#5) remains in constant tension by
means of a spring tensioned idler (#1). If belt slips under
normal operating load conditions, retention spring (#4)
by tightening eyebolt (#2). Replace belt when it becomes
excessively worn or damaged. Instructions for replacing
the ground drive belt are provided on page 38.
1. Check length of ground drive extension spring (#4) to
verify if belt tension is correct. Installed spring length
should be 7" +/- 1/8" (See Figure 3-8).
2. Adjust belt tension as follows:
a. Loosen hex whiz nut (#3A).
b. Tighten or loosen whiz nut (#3B) until spring
length is 7" as shown in Figure 3-8.
c. When adjustment is complete, hold hex whiz
nut (#3B) still while tightening hex whiz nut (#3A).
Deck Drive Belt Tensioning
Refer to Figure 3-9:
The deck belt (#9) remains in constant tension by means
of the spring tensioned idler (#8). If belt slips under
normal operating load conditions, re-tension spring (#4)
by tightening up eyebolt (#2). Replace deck belt when it
becomes excessively worn or damaged. Instructions for
replacing the deck drive belt are provided on page 37.
Vary spring length by adjusting length of eye bolt (#2).
Additional adjustments to the spring length can be made
by changing which hole in Arm (#1) the spring is
attached. There are two holes for this adjustment.
1. With deck cutting height set at 3", check length of
extension spring (#4) to verify proper belt tension.
Installed spring length should be 7" +/- 1/8" (See
Figure 3-8).
2. Adjust belt tension as follows:
a. Loosen hex whiz nut (#3A).
b. Tighten or loosen whiz nut (#3B) until spring
length is 7" as shown in Figure 3-8.
c. When adjustment is complete, hold hex whiz
nut (#3B) still while tightening hex whiz nut (#3A).
IMPORTANT: Do not over tension drive belts to
compensate for a badly worn belt or pulley.
An over tensioned belt can cause the belt and drive
components to break prematurely resulting in a
safety hazard to the operator and bystanders.
An under tensioned belt can cause the belt to slip
and become damaged.
Ground Drive Belt Adjustment
Figure 3-7
Take-up Spring Length
Figure 3-8
Deck Drive Belt Adjustment
Figure 3-9
33777
Spring Length = 7" +/- 1/8"
33200
33778