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Section 4 Maintenance and Lubrication
7/18/08
DM35 Series (S/N253045+) Disc Mowers 309-502M
Land Pride
Table of Contents
General Maintenance
Proper servicing and adjustment is the key to the long life
of any farm implement. With careful and systematic
inspection, you can avoid costly maintenance, time and
repair.
!
DANGER
Before servicing this machine, turn off the tractor engine,
remove the ignition key and disconnect the PTO driveline.
Each new machine should be checked after the first 10
hours of work. All screws and bolt torques should be
routinely checked.
At the beginning of each season:
1. Check and/or change the oil; lubricate or grease all
points. See Lubrication in this section.
2. Check blade wear and condition of their fasteners, see
“Servicing Blades”, page 17.
3. Check wear on guards and curtain.
4. Retention belts, see “Belt Tensioning Adjustment”,
page 15.
5. Check all screws and bolts to be sure they are tight.
Servicing Blades
Cutting quality as well as safe operation depend on the
regular inspection and care given to the knives.
!
WARNING
To avoid personal injury when the blades and/or carrier are
being serviced, always block the 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.
!
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 the 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
1. See Figure 5-1a. New blades are 1 3/4” wide. Blades
should be replaced when they are worn to about
1 5/16” (B) wide at a distance of 3/8” from the disk. The
length (A) of the blade should be greater than 2 1/2”.
2. See Figure 5-1b. Replace blades if the hole for the
securing bolt has become oval 3/32” more than the
diameter of the original hole.
Fastener Replacement
1. Replace fasteners when a visible deformation is
found.
2. See Figure 5-2a. Replace bolts when wear on the bolt
head reaches the contact area of the blade.
3. Replace bolts when the flat sides at the bolt flange are
excessively worn or missing altogether.
4. See Figure 5-2b. Replace bolts when the diameter (D)
of the bolt shoulder is less than 5/8”.
5. See Figure 5-2c. Replace nuts when the height (H) of
the nut less is than half of the original height of 5/16”.
6. Replace Belleville washers on breakaway if they are
flattened.
Blade Wear
Figure 5-1
15093
a
b
NOTE: Always replace blade bolts and nuts when
they have been removed 5 times.
Section 4 Maintenance and Lubrication