909793/BP0805 26 Printed in U.S.A.
CHAPTER 9
SERVICE
GENERAL INFORMATION
WARNING
BEFORE servicing the disc mower, exercise
the MANDATORY SAFETY SHUTDOWN PRO-
CEDURE (page 8).
NOTE: All services, detailed in this chapter are
owner/operator responsibilities. Where indicated,
certain service routines should only be carried out
by (or under the direction of) an authorized Gehl
equipment dealer.
CUTTERBAR
All service to the internal parts of the cutterbar MUST
be carried out by (or under the direction of) an
authorized Gehl equipment dealer.
DISCS, KNIVES AND HARDWARE
Discs, knives, bolts and nuts are fabricated from high
quality steel and undergo a special heat treatment
process to ensure a tough wear resistance and longer
life.
WARNING
To avoid creating hazardous out-of-balance
forces, ALWAYS replace missing, damaged or
worn knives and hardware in pairs!
IMPORTANT: Worn or damaged items MUST be
replaced immediately with genuine GEHL service
parts, otherwise the warranty is void.
WARNING
Use ONLY genuine GEHL service parts.
Knife Hardware (Fig. 17)
If any of the following conditions exist, the knife
retaining hardware MUST be replaced. See Fig. 17 for
details.
1. When a visible deformation is found.
2. When the locking compound on the bolt threads
has worn away or if the locking compound has
become inoperative due to contamination by
water, oil or dirt.
3. When a wear groove deeper than 1/8” (3mm) has
formed on the bearing shoulder of the knife bolt
(Ref. 2).
4. When wear on the bolt head reaches the contact
area of the knife (Ref. 3).
5. When the contact washer of the knife retaining nut
has lost its elasticity or the washer becomes loose
from the nut (Ref. 5).
6. When wear on the nut reaches a depth equal to half
the height of the nut (Ref. 6).
7. When the retaining hardware has been removed 5
times.
1 - Acceptable Bolt with Locking Compound Intact
2 - Unacceptable Bolt with Wear Groove
3 - Unacceptable Bolt with Edge Wear
4 - Acceptable Nut with Contact Washer
5 - Unacceptable Nut with Contact Washer Crushed
6 - Unacceptable Nut with Edge Wear
Fig. 17
1
2
3
4
5
6
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