Troubleshooting - National Mower 68 DL TRIPLEX Owner's Manual

All adjusting must be made with the engine off.
DANGER
Do not do any investigation of the working parts of the machine with the motor running.
Always turn the engine off!
Tractor Unit
Situation
Engine will not start
Mower will not move
Mower will not stop
Cutting Units
Situation
Cutting units will not turn.
Cutting units turn but
will not cut
Cutting units will not stop
turning
Uneven cut
68OM-06/03
TROUBLE-SHOOTING
Turn ignition switch to on
Ensure that there is sufficient gasoline (petrol) in the tank
Make sure safety switches are making contact and mowing clutch is in
neutral
Look for a loose wire on ignition or spark plug wire not connected
Interlock system inoperative—check wiring, see "Electrical Diagrams"
Operator must be positioned on seat to depress safety switches
(Model 68 DL only)
Differential gear selector must be in one of the drive positions
Engine drive clutch must be engaged
Drive belts too loose (see "Drive Belt Tension" in Maintenance section)
Visually check to see that pulleys are not slipping on shafts
If everything above is OK, check for a damaged gear(s) in the differential
gear box
Ensure that the main clutch is disengaged (brake will not stop engine)
Brake adjustment or service may be needed.
Clutches may not be engaged
Look for anything that could be jammed between the reel and the bed knife
Drive belts or drive chain may need tightening
Visually check that both the drive pulleys and the shafts are rotating
Reel bed knife position may be out of adjustment (see "Reel to Bed Knife
Adjustment" in Maintenance section)
Drive belts or drive chain may need adjustment.
Visually check that both the drive pulleys and the shafts are rotating
Disengage all clutches
Set height of cut to the same height on each cutting unit (see "Cutting Height
Adjustment" in Operation section of this manual.)
Check to see if any part is bent
Something may be jammed in cutting unit pivots and/or lift pivots, preventing
the cutting units from floating
NATIONAL 68 SR & DL TRIPLEX
Things To Check
Things To Check
®
27