Section 5: Maintenance & Lubrication
RCR1548 Rotary Cutters 312-556M
8/1/23
28
Protected Drivelines
WARNING
!
To avoid serious injury or death:
Always follow “Tractor Shutdown Procedure” provided in
this manual before dismounting the tractor.
Cutter drive components are protected from shock loads
by either a two plate friction clutch or a shear bolt. The
shear bolt is designed to shear off when the blade
impacts objects that the cutter is not designed to cut
through. Avoid shear bolt failure by engaging the power
take-off slowly at low engine rpm. Replace shear bolt &
nylock nut with genuine Land Pride part numbers only.
See available part numbers below. For installation
instructions, refer to
Clutch Run-In
Figure 4-3
Clutch Run-In
The clutch must be capable of slippage during operation
to protect gearbox, driveline and other drivetrain parts.
Friction clutches should be “Run-in” prior to initial
operation and after long periods of inactivity. To protect
driveline and gearbox, repeat “Run-In” instructions at the
beginning of each season and when moisture and/or
condensation seizes the inner friction plates.
Refer to Figure 4-3:
1.
Using a pencil or other marker scribe a line across the
exposed edges of the clutch plates and friction discs.
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.
Shear Bolt & Nut Part Numbers
Part No.
Part Description
802-264C
HHCS 1/2-13X3 1/2 GR2
803-147C
NUT HEX NYLOCK 1/2-13
OR
803-020C
NUT HEX 1/2-13 PLT
803-036C
NUT HEX JAM 1/2-13 PLT
13693
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 the 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 disc and plate are still aligned.
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
operation and periodically each week. An additional
set of scribe marks can be added to check for
slippage. See
to adjust for
proper spring length.
Clutch Disassembly
Refer to Figure 4-4:
To disassemble the clutch, first remove the spring
retainer nuts (#1), springs (#2), and bolts (#3) from the
assembly. Each friction disc (#4) must then be separated
from the metal surface adjacent to it. Inspect all parts for
excessive wear and condition. Clean all parts that do not
require replacement.
Clutch Disassembly
Figure 4-4
Inspection
Inspect all parts for excessive wear and condition. Clean
all parts that do not require replacement.The original
friction disc thickness is 1/8" (3 mm) and should be
replaced if the thickness falls below 3/32" (2.4 mm). If the
clutches have been slipped to the point of “smoking”, the
friction discs may be damaged and should be replaced.
Heat build-up may also affect the yoke joints.
Clutch Assembly
Refer to Figure 4-4:
Reassemble each friction disc (#4) next to the metal plate
it was separated from. Make certain the bushing is
positioned as shown. Install bolts (#3) through the end
plates and intermediate plates as shown. Place
springs (#2) over the bolts and secure with nuts (#1).
IMPORTANT:
If clutch run-in procedure indicated
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