Section 5: Maintenance & Lubrication
7/31/20
RC4620 & RCM4620 Rotary Cutters 331-936M
50
Type A Clutches
Clutch Run-In
Refer to Figure 5-7:
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 hex
end of retainer bolt in
order to count the exact
number of revolutions
.
Type A Clutch Run-In
Figure 5-7
3. Make sure the area is clear of all bystanders and
machine is safe to operate.
4. Start tractor and engage power take-off drive for 2-3
seconds to permit slippage of the clutch surfaces.
Disengage power take-off, then re-engage a second
time for 2-3 seconds. Disengage power take-off, shut
off tractor, and remove key. Wait for all components to
stop before dismounting from tractor.
5. Inspect clutch and ensure that the 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
6. Tighten each of the 8 spring retainer nuts on the
clutch housing exactly 2 revolutions to restore clutch
to original setting pressure.
7. Allow clutch to cool to ambient temperature before
operating again. Clutch is now ready for use.
8. The clutch should be checked during the first hour of
cutting and periodically each week. An additional set
of scribe marks can be added to check for slippage.
See Figure 5-9 to adjust spring length.
Clutch Disassembly, Inspection & Assembly
Refer to Figure 5-8:
If clutch run-in procedure above indicated that one or more
friction disks did not slip, then the clutch must be
disassembled to separate the friction disks.
13693
Disassembly
1. Removing spring retainer nuts (#1), springs (#2), and
bolts (#3).
2. Separate disk (#4) from metal surfaces adjacent to
them.
Type A Clutch Assembly
Figure 5-8
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" (3.2mm) and should be
replaced if thickness falls below 3/64" (1.1mm). If
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.
Assembly
1. Reassemble each friction disk (#4) next to the metal
plate it was separated from.
2. Install bolts (#3) through end plates and intermediate
plates as shown.
3. Place springs (#2) over the bolts and secure with
nuts (#1).
Refer to Figure 5-9:
4. Progressively tighten each spring retainer bolt until
correct spring height “A” is reached.
Type A Clutch Adjustment
Figure 5-9
Driveline No.
Driveline
Location
Cat
No.
Spring Height
"A’ Dimension
826-819C
Wing
5
1.32 in. / 33.5 mm
826-820C
Center
5
1.32 in. / 33.5 mm
IMPORTANT:
Not all clutches are assembled the
same with the same number of components. Be sure
to keep track of order and orientation of your clutch
components during disassembly.
14714
IMPORTANT: Keep
track of order and orientation of
your clutch components during disassembly
24600
