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Section 7: Troubleshooting
9/15/06
DM3705, DM3706, and DM3707 Series Disc Mowers 327-083M
Table of Contents
Section 7: Troubleshooting
Problem Cause Solution
Not cutting clean
Dull Blades. Replace blades.
Mower not level. Adjust machine.
Ground speed too fast. Reduce ground speed.
Blades locked back. Free blades.
Blade on wrong for rotation of disc Change blade pairs for correct rotation blades
Streaking conditions in
swath
Conditions too wet for cutting. Allow grass to dry before cutting. Slow ground
speed of tractor but keep engine running at full
PTO rpm.
Dull blades. Sharpen or replace blades.
Wet mud build-up between skid shoes. Clean area between skids. Raise cutting height.
Blade on wrong for rotation of disc Change blade pairs for correct rotation blades
Gearbox noisy
Rough gears. Run in or gear failure.
Worn bearing. Replace bearing.
Gearbox leaking
Damaged oil seal. Replace seal.
Bent shaft. Replace oil seal and shaft.
Oil seal not sealing in housing. Replace seal or use a sealant on OD of seal.
Oil level too high. Drain oil to proper level.
Gasket damaged. Replace gasket.
Bolts loose. Tighten bolts.
Uneven stubble
Too much tilt on cutter bar. Reduce tilt.
Low PTO speed. Increase engine speed to run PTO at 540 rpm.
Blades not installed correctly. Make sure that arrow on knife upper face is
pointing in the direction of rotation of the disc.
Low disc speed. Check belt for correct tension.
Dull or broken blades. Replace blades.
3-point arms not level causing float mechanism to
not function properly
Level three point arms
Stubble too long
Incorrect angle on cutter bar. Change cutter bar angle using tractor top link.
Insufficient cutter bar down pressure. Adjust compensating spring tension.
3-point arms not level causing float mechanism to
not function properly
Level three point arms
Soil built up in front of
cutter bar
Very wet conditions Adjust main frame height by shortening safety
chain as necessary.
Too much cutter bar down pressure Adjust compensating spring tension.
3-point arms not level causing float mechanism to
not function properly
Level three point arms
Machine breaking back
too easily
Insufficient tension on break-away spring washers. Tighten break-away spring.
3-point arms not level causing float mechanism to
not function properly
Level three point arms
Belleville washers flattened Replace with new Belleville washer part no.