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Section 4: Maintenance and Lubrication
9/15/06
DM3705, DM3706, and DM3707 Series Disc Mowers 327-083M
Table of Contents
General Maintenance
Proper servicing and adjustment is the key to long life of
any implement. With careful and systematic inspection,
you can avoid costly maintenance, time and repair.
!
DANGER
Before servicing this implement, turn off tractor engine, remove
ignition key and disconnect PTO driveline.
Each new mower should be checked after the first 10
hours of work. All screws and bolt torques should be
routinely checked.
At beginning of season:
6. Check and/or change oil; lubricate or grease all
points. See Lubrication in this section.
7. Check blade wear and condition of their fasteners,
see “Servicing Blades”, page 21.
8. Check wear on guards and curtain.
9. Inspect belts, see “Belt Tension Adjustment”,
page 20.
10. Check all screws and bolts to be sure they are tight.
Servicing Blades
Cutting quality as well as safe operation depend on
regular inspection and care given to the knives.
!
WARNING
To avoid personal injury when blades and/or carrier are being
serviced, always block mower up to prevent it from falling.
Check blades for cracks and wear and blade bolts for
tightness daily. Blades should be replaced when they are
worn excessively, bent, nicked, deformed, or out of
balance.
Blades are sharpened on both edges so that they may be
turned over to extend their cutting life. Always turn over
both blades on a cutterplate at the same time.
!
CAUTION
Replace with Land Pride blades only. Substitute blades may not
meet specifications and may fail in a hazardous manner that
could cause injury.
NOTE: Blade bolts should be tightened to 55 ft-lb
torque.
NOTE: Always replace damaged blades. Never
straighten a bent blade. Never replace one knife
only per disc. Always replace both of them to avoid
creating an out-of-balance force.
!
CAUTION
When changing blades, always replace blade bolt & blade nut
together at the same time. Worn or damaged blade bolts or nuts
could fail in a hazardous manner that could cause injury.
Blade Replacement
Refer to Figure 4-1:
1. New blades are 1.85” wide. Blades should be
replaced when they are worn to about 1 5/16” (B)
wide at a distance of 3/8” from the disc. Length (A) of
the blade should be greater than 2 1/2”.
2. Replace blades if hole for securing bolt has become
oval by 3/32” more than diameter of original hole.
Blade Wear
Figure 4-1
Blade Fastener Replacement
1. Replace fasteners when a visible deformation is
found.
2. Replace bolts when wear on bolt head reaches
contact area of blade.
3. Replace bolts when flat sides at bolt flanges are
excessively worn or missing altogether.
Refer to Figure 4-2:
4. Replace bolts when diameter (D) of bolt shoulder is
less than 5/8”.
5. Replace nuts when height (H) of nut is less than half
of original height of 3/8”.
Figure 4-2
NOTE: Always replace blades on cutterplates in
pairs.
15093
NOTE: Always replace blade bolts and nuts when
they have been removed 5 times.
20798
Section 4: Maintenance and Lubrication