MK Martin Pulsar PTM48, Operator'S Manual, Page: 28 / 32

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Issue
Cause Solution
Knife disc is loose
Tighten knife disk mounting bolt: torque to 150 lb-ft 15/16”
socket.
One or more swing knives are loose Retighten swing knife mounting hardware: torque to 50 lb-ft
One or more swing knives are dull Sharpen dull or nicked swing knives
Wiring damaged check wiring from control panel to electric clutch
Estop switch worn Remove and replace estop control switch.
Electric clutch worn have the clutch inspected by a qualified mechanic
Spindle bearings or spindle shaft worn.
Inspect spindle bearings or spindle shaft for unusual play,
replace if required.
Knife disc is loose
Tighten knife disk mounting bolt: torque to 150 lb-ft 15/16”
socket.
One or more swing knives are loose Retighten swing knife mounting hardware: torque to 50 lb-ft
One or more swing knives are damaged Inspect swing knives, replace if bent or broken
knife disc is damaged Inspect knife disk, replace if bent or broken
Pulley grooves dirty or damaged
Inspect and clean pulley's with steel wool. File off cuts or
nicks.
Inspect belt for stretching.
Inspect idler tension spring, check measurement (measures
3.625 to 3.75“) adjust if required, replace if broken
Inspect belt for wear or hard spots.
Knife disc is loose
Tighten knife disk mounting bolt: torque to 150 lb-ft 15/16”
socket.
One or more swing knives are loose Retighten swing knife mounting hardware: torque to 50 lb-ft
One or more swing knives are dull Sharpen dull or nicked swing knives
Hieght adjustment issue
Inspect hieght adjust system is not damged and adjustes
evenly
Low engine RPM Run engine at full RPM
Belt slipping
Inspect idler tension spring, check measurement (measures
3.625 to 3.75“) adjust if required, replace if broken
Deck plugged, grass accumulation Clean underside of deck
Wet grass Cut grass after it has dried out
One or more swing knives are damaged Inspect swing knives, replace if bent or broken
Knife disc is damaged Inspect knife disk, replace if bent or broken
Spindle bearings or spindle shaft worn.
Inspect spindle bearings or spindle shaft for unusual play,
replace if required.
Uneven ground
Reduce ground speed, raise cutting height, and/or change
direction of cut pattern
Ground speed too fast Slow speed to adjust for conditions
Knives are not cutting, or
are loose
Knives will not engage and/
or disengage
Excessive vibration when
engaging the mower
Belt loose
Belt fraying or rolls off of
pulley's
Uneven cut
Trouble Shooting
Engine: Refer to the engine manufacturer’s manual for maintenance and service information.