Pto Clutch Adjustment - Allis-Chalmers AC-130 Series Operator's Manual

PTO Clutch Adjustment

WARNING
To avoid serious injury, perform adjustments only
with engine stopped, key removed and tractor on
level ground.
Check the PTO clutch adjustment after every 250 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. Note the position of the 3 adjustment windows (A,
Figure 29) 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,
Figure 30) through each window, positioning the
gauge between the rotor face and the armature face.
4. Alternately tighten the adjustment nuts (B) 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.
7. Perform the "Blade Brake Check" found in the REGU-
LAR MAINTENANCE section. Mower blades and
mower drive belt should come to a complete stop
within five seconds after electric PTO switch is turned
off.
Troubleshooting, Adjustment, & Service
A
B
Figure 29. PTO Clutch Adjustment
A. Adjustment Window (Qty. 3, one shown)
B. Adjustment Nut (3)
B
Figure 30. Adjust PTO Clutch
A. Window
B. Adjustment Nut
C. Feeler Gauge
31
B
B
C
A