Toro 74504TE, Руководство оператора, Страница: 42 / 64

Using the Clutch Shim
Some later model year units have been built with clutches that
contain a brake shim. When the clutch brake has worn to the
point where the clutch no longer engages consistently, you
can remove the shim to extend the clutch life.
Figure 54
1. Armature 5. Brake spacer
2. Field shell 6. Regap the shim.
3. Rotor 7. Brake pole
4. Brake-mounting bolt
Removing the Clutch Shim
1. Shut off the engine, wait for all moving parts to stop,
and remove the key.
2. Engage the parking brake and wait for machine to cool
completely.
3. Using an air compressor, blow out any debris under the
brake pole and around the brake spacers.
Figure 55
4. Check the condition of the wire-harness leads,
connectors, and terminals. Clean or repair them as
necessary.
5. Verify that 12 V is present at the clutch connector
when the you engage the blade-control switch (PTO).
6. Measure the gap between the rotor and armature. If
the gap is greater than 1 mm (0.04 inch), proceed with
the following steps:
A. Loosen both brake mounting bolts 1/2 to 1 full
turn as shown in
Figure 56 .
Note:
Do not remove the brake pole from the
field shell/armature. The brake pole has worn
to match the armature and needs to continue to
match after you remove the shim to ensure the
proper brake torque.
Figure 56
1. Brake-mounting bolt
B. Using needle-nose pliers, or by hand, remove the
shim.
Note:
Do not discard the shim until you confirm
that the clutch functions properly.
Figure 57
1. Shim
C. Using a pneumatic line, blow out any debris under
the brake pole and around the brake spacers.
D. Torque each bolt (M6 x 1) to 12.3 to 13.7 N∙m
(9.5 to 10.5 ft-lb).
E. Using a 0.25 mm (0.010) inch thick-feeler gauge,
verify that a gap is present between the rotor and
armature face on both sides of the brake pole as
shown in
Figure 58 and Figure 59 .
Note:
Due to the way the rotor and armature
faces wear (peaks and valleys), it is sometimes
difficult to measure the true gap.
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