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11/01/11
RTR0542 and RTR0550 Rotary Tillers 311-464M
Section 4: Maintenance& Lubrication
Table of Contents
Refer to Figure 4-2:
1.
Using a pencil or other marker scribe a line across the
exposed edges of the clutch plates and friction disks.
2.
Carefully loosen each of the 8 spring retainer nuts by
exactly 2 revolutions. It will be necessary to hold the
hex end of the retainer bolt in order to count the exact
number of revolutions.
3.
Start the tractor and engage the driveline drive for
2-3 seconds to permit slippage of the clutch
surfaces. Disengage the driveline, then re-engage a
second time for 2-3 seconds. Disengage driveline,
shut off tractor, and remove key. Wait for all
components to stop before dismounting from tractor.
4.
Inspect clutch to ensure scribed markings made on
the clutch plates have changed position. Slippage
has not occurred if any two marks on the friction disk
and plate are still aligned. A clutch that has not
slipped must be disassembled to separate the
friction disk plates. See “Clutch Disassembly” to
disassemble clutch.
5.
Tighten each of the 8 spring retainer nuts on the
clutch housing exactly 2 revolutions to restore the
clutch to the original setting pressure.
6.
The clutch should be checked during the first hour of
tilling and periodically each week. An additional set
of scribe marks can be added to check for slippage.
See “Clutch Assembly” to adjust for proper spring
length.
Clutch Disassembly
Refer to Figure 4-3:
Disassembly of the clutch is simply a matter of first
removing the spring retainer nuts (#9a), springs (#2), and
bolts (#9b) from the assembly. Each friction disk (#5)
must then be separated from the metal surface adjacent
to it.
Inspection
Inspect all parts for excessive wear and condition. Clean
all parts that do not require replacement.The original
friction disk thickness is 1/8" and should be replaced if
the thickness falls below 3/32". If the clutches have been
slipped to the point of “smoking”, the friction disks may be
damaged and should be replaced. Heat build-up may
also affect the yoke joints.
Clutch Assembly
Refer to Figure 4-3:
Reassemble each friction disk (#5) next to the metal
plate it was separated from. Make certain bushing #4 is
positioned as shown. Install bolts (#9b) through the end
plates and intermediate plates as shown. Place springs
(#2) over the bolts and secure with nuts (#9a).
Refer to Figure 4-4:
Progressively tighten each spring retainer bolt until
correct spring length “B” is reached.
•
B = 1.335
"
to 1.345
"
Clutch Run-In
Figure 4-2
Clutch Assembly
Figure 4-3
Clutch Adjustment
Figure 4-4
13693
23844
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