Craftsman 28992 Operation Manual - Page 27

Check, Clutch

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CHECK / ADJUST PTO CLUTCH WARNING To avoid serious injury, perform adjustments only with engine stopped, key removed and tractor on level ground. Service Interval: 200 Hours. The Power Take Off (PTO) clutch drives the mower blades. The PTO clutch is engaged and disengaged by the mower blade switch. Check the PTO clutch adjustment every 200 hours of operation. Also perform the following procedure if the clutch is slipping, 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 accidental starting while the PTO is being adjusted. 2. Note the position of the 3 adjustment windows (A, Figure 28) in the side of the brake plate and the nylock adjustment nuts (B). 3. Insert a .012"-.015" (2,5-4 mm) feeler gauge (C) through each window, positioning the gauge between the rotor face and the armature face as shown in Figure 29. 4. Alternately tighten the adjustment nuts (B, Figure 29) 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 loosening the adjustment nuts. NOTE: The actual air gap between the rotor and armature may vary even after performing the adjustment procedure. This is due to dimensional variations on component parts, and is an acceptable condition. 6. Check the mower blade stopping time. The mower blades and mower drive belt should come to a complete stop within five seconds after the electric PTO switch is turned off. If adjustment does not stop a mower braking problem, replace the electric PTO clutch. Figure 28. PTO Clutch Adjustment A. Adjustment Window (Qty. 3, one shown) B. Adjustment Nut (3) Figure 29. Adjust PTO Clutch A. Window B. Adjustment Nut C. Feeler Gauge 27

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CHECK
/
ADJUST
PTO
CLUTCH
WARNING
To avoid serious
injury, perform adjustments
only
with engine stopped,
key removed and tractor on
level ground.
Service
Interval:
200 Hours.
The Power Take Off (PTO) clutch drives the mower
blades. The PTO clutch is engaged
and disengaged
by
the mower blade switch. Check the PTO clutch adjust-
ment every 200 hours of operation.
Also perform the fol-
lowing procedure
if the clutch is slipping, 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.
Note the position of the 3 adjustment
windows
(A,
Figure 28) in the side of the brake plate and the
nylock adjustment
nuts (B).
3.
Insert a .012"-.015"
(2,5-4 mm) feeler gauge (C)
through each window, positioning
the gauge between
the rotor face and the armature face as shown in
Figure 29.
4. Alternately
tighten the adjustment
nuts (B, Figure 29)
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. If adjustment
does not stop a
mower braking problem,
replace the electric
PTO
clutch.
Figure 28.
PTO Clutch Adjustment
A. Adjustment
Window
(Qty. 3, one shown)
B. Adjustment
Nut (3)
Figure 29. Adjust PTO Clutch
A.
Window
B. Adjustment
Nut
C. Feeler Gauge
27