Ferris Industries IS4000Z/KAV27 - Manual (Page 30)

28
Troubleshooting, Adjustment & Service
WARNING
To avoid serious injury, perform adjustments only
with engine stopped, key removed and tractor on
level ground.
C
A B
B
B
A
B
Figure 35. PTO Clutch Adjustment
A. Adjustment Window (Qty. 3, one shown)
B. Adjustment Nut
Figure 36. Adjust PTO Clutch
A. Window
B. Adjustment Nut
C. .016” - .018” (0,40mm - 0,45mm) Feeler Gauge
PTO CLUTCH ADJUSTMENT
Check the PTO clutch adjustment after the initial 50 hour
break-in period and then after every 250 hours of opera-
tion. 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 35. 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” (0,40mm - 0,45mm) feeler
gauge (C) through each window, positioning the
gauge between the rotor face and the armature face
as shown in Figure 36.
4. Alternately tighten the adjustment nuts (B, Figure 35)
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 (5) 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 (5) seconds after electric PTO
switch is turned off.
1. With parking brake engaged, PTO disengaged and
an operator in the seat, start the engine engine.
2. Look down through the gap between the left side of
the floor and frame rail and observe the PTO drive
belt. Engage the PTO and wait several seconds.
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 (5)
seconds, perform the PTO Clutch Adjustment. If the
belt still does not stop within five (5) seconds, see
your dealer.