Chapter 9 - Service
Printed in U.S.A. 27 909793/BP0805
Knife Removal & Replacement
(See Fig. 18)
Knives should be inspected systematically each time
before the disc mower is operated. Failure to replace
knives as required will result in an increase in the risk
of accidents, a deterioration in the quality of cut and
a risk of damage to the cutterbar. Both knives on each
disc MUST be replaced in pairs to maintain balance
if any of the following conditions exist:
1. If any sign of cracking is found.
2. Refer to Fig. 18. The width of a knife (Ref. 2),
measured at a distance of 3/8” (10 mm) away from
the edge of the disc (Ref. 1), MUST be greater
than
1-3/8” (34 mm).
3. The hole in the knife for the retaining bolt MUST
NOT be worn oval by more than 1/16” (2 mm).
See Fig. 18, Ref. 3.
1 - 3/8” (10 mm)
2 - 1-3/8” (34 mm)
3 - Maximum Out-of-round 1/16” (2 mm)
Fig. 18
3
1
2
When replacing a knife (knives MUST BE replaced in
sets) on the disc mower, the following steps MUST be
followed:
1. Clean around the self-locking nut to be removed.
2. Position the disc to allow the knife retaining bolt
to drop through the access hole in the front, center
of the skid shoe.
3. Remove the self-locking nut with the box wrench
provided with the disc mower (or an 18 mm sock-
et).
4. Fit a new knife or turn the worn knife over to use
second cutting edge. BE SURE that the knife is
positioned with the small arrow pointing in the di-
rection of rotation of the corresponding disc.
5. BE SURE the bolt is in good condition BEFORE
reusing.
6. Torque locknuts to 90 ft.-lbs. (120 Nm).
WARNING
Use ONLY genuine Gehl service parts.
IMPORTANT: To ensure proper knife retention,
the retaining hardware MUST be replaced after
having been removed five times.
WARNING
ALWAYS replace damaged knives in pairs.
NEVER attempt to straighten a bent knife or
replace a single knife.
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