Not for
Reproduction
14
Simplicity / Massey Ferguson / Snapper ZTR
WARNING
To avoid serious injury, perform adjustments only
with engine stopped, key removed and rider on
level ground.
A
B
B
B
Figure 18. PTO Clutch Adjustment
A. Adjustment Window (Qty. 3, one shown)
B. Adjustment Nut
B
A
C
Figure 19. Adjust PTO Clutch
A. Window
B. Adjustment Nut
C. .016”-.018” (0,40-0,45mm) Feeler Gauge
PTO Clutch Adjustment
Check the PTO clutch adjustment after every 100 hours
of operation. Also perform the following procedure if the
clutch is slipping or will not engage, or if a new clutch
has been installed.
1. Remove key from ignition switch and disconnect
spark plug wires to prevent the possibility of acciden-
tal starting while the PTO is being adjusted.
2. See Figure 18. Note the position of the 3 adjustment
windows (A) in the side of the brake plate and the
nylock adjustment nuts (B).
3. Insert a .016”-.018” (0,40-0,45mm) feeler gauge (C)
through each window, positioning the gauge between
the rotor face and the armature face as shown in
Figure 19.
4. Alternately tighten the adjustment nuts (B, Figure 18)
until the rotor face and armature face just contacts
the gauge.
5. Check the windows for an equal amount of tension
when the gauge is inserted and removed, and make
any necessary adjustments by tightening or loosen-
ing the adjustment nuts.
NOTE: The actual air gap between the rotor and arma-
ture may vary even after performing the adjustment pro-
cedure. This is due to dimensional variations on compo-
nent parts, and is an acceptable condition.
6. Check the mower blade stopping time. The mower
blades and mower drive belt should come to a com-
plete stop within five seconds after the electric PTO
switch is turned off.
Blade Brake Check
Mower blades and mower drive belt should come to a
complete stop within five seconds after electric PTO
switch is turned off.
1. With parking brake engaged, PTO disengaged and
an operator in the seat, start the engine.
2. Have an assistant observe the mower drive belt
through the opening between the frame and top of
mower deck. Engage the PTO and wait several sec-
onds. Disengage the PTO and check the amount of
time it takes for the mower drive belt to stop.
3. If the mower drive belt does not stop within five sec-
onds, perform the PTO Clutch Adjustment. If the
belt still does not stop within 5 seconds, replace the
clutch.
