TROUBLE-SHOOTING

Tractor Unit

 

 

 

Situation

Things To Check

 

 

Engine will not start

Turn ignition switch to on

 

Ensure that there is sufficient gasoline (petrol) in the tank

 

Make sure safety switch is making contact and mowing clutch is down

 

Look for a loose wire on Ignition or spark plug wire not connected

 

Operator must be positioned on seat to depress presence switches

 

Interlock system inoperative—check wiring, see Figure K

 

 

Tractor will not move

Gear selector must be in one of the drive positions

forward

Engine drive clutch must be engaged (rearward and up)

 

Drive belts too loose (see page 17)

 

Visually check to see that pulleys are not slipping on shafts

 

If everything above is OK, check for a damaged gear in the gear box

 

 

Tractor will not move

Same as above. If all of the above check OK, check the reverse gear in the

rearward

gear box

 

 

Tractor will not stop

Ensure that the main clutch is disengaged (brake will not stop engine)

 

Brake adjustment or service may be needed (see page 17)

 

 

Cutting Units

 

 

 

Situation

Things To Check

 

 

Wing and/or rear mow-

Bed knife to reel position may be out of adjustment (see page 16)

er will not cut

Drive belts or drive chains may need tightening

 

Visually check that both the drive pulleys and the shafts are rotating

 

 

Cutting units will not turn.

Clutches may not be engaged

 

Look for anything that could be jammed between the reel and the bed knife

 

Drive belts or drive chains may need tightening

 

Visually check that both the drive pulleys and the shafts are rotating

 

 

Units will not stop turning

Disengage all clutches

 

 

Uneven cut

Height of cut not the same on each cutting unit (see page 16)

 

Check to see if any part is bent

 

Something jammed in cutting unit pivots, not allowing them to float

 

 

Electrical System (DL 68" only) Check wiring connections and switch operation—see Figure 9, page 34

All adjusting must be made with the engine off.

Do not do any investigation of the working parts of the machine with the motor running. Always turn the engine off!

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National Mower DL 68, SR 68 owner manual Trouble-Shooting