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18 Owner Service
MAN0680 (11/30/2007)
Gearbox Lubrication
For gearbox, use a high quality gear oil with a viscosity
index of 80W or 90W and an API service rating of GL-4
or -5 in gearboxes. Fill gearbox until oil runs out the
side plug on gearbox. Check gearbox daily for evi-
dence of leakage, and contact your dealer if leakage
occurs.
Driveline Lubrication
1. Lubricate the driveline slip joint every eight
operating hours. Failure to maintain proper
lubrication could result in damage to U-joints,
gearbox, and driveline.
2. Lower cutter to ground, disconnect driveline from
tractor PTO shaft, and slide halves apart but do not
disconnect from each other.
3. Apply a bead of grease completely around male
half where it meets female half. Slide drive halves
over each other several times to distribute grease.
SLIP CLUTCH ADJUSTMENT
The slip clutch is designed to slip so that the gearbox
and driveline are protected if the cutter strikes an
obstruction.
A new slip clutch or one that has been in storage over
the winter may seize. Before operating the cutter, make
sure it will slip by performing the following operation:
1. Turn off tractor engine and remove key.
2. Remove driveline from tractor PTO.
3. Loosen six 12 mm cap screws (7) to remove all
tension from the compression springs (8).
4. Hold clutch hub (3) solid and turn shaft to make
sure clutch slips.
5. If clutch does not slip freely, disassemble and clean
the flange yoke (1), clutch hub (3), drive plate (4),
drive plate (5), and thrust plate faces (6).
6. Reassemble clutch.
7. Compress each of the six compression springs (8)
by tightening the six cap screws (7) and lock nuts
(10). The compression springs should be
compressed to a height of 1-7/16", not including
washer (9). The minimum spring height is 1.36".
See Figure 12.
8. If a clutch continues to slip when the springs are
compressed to 1.36", check friction discs (2) for
excessive wear. Discs are 1/8" when new. Replace
discs after 1/16" wear.
Figure 12. Slip Clutch Assembly
1. Flange yoke
2. Friction disc
3. Hub, 1-3/4" 20 Spline
4. Drive plate
5. Drive plate
6. Thrust plate
7. 12 mm x 115 mm GR8.8 HHCS
8. Compression spring
9. Flat washer
10. 12 mm x 1.25P Nylok lock nut
11. 12 mm x 65 mm GR8.8 HHCS
12. 12 mm x 1.5P Nylok lock nut