®
NATIONAL 68 SR & DL TRIPLEX
TROUBLE-SHOOTING
DANGER
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!
Tractor Unit
| Situation | Things To Check |
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| Engine will not start | Turn ignition switch to on | |
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| Ensure that there is sufficient gasoline (petrol) in the tank | |
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| Make sure safety switches are making contact and mowing clutch is in | |
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| neutral | |
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| Look for a loose wire on ignition or spark plug wire not connected | |
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| Interlock system | |
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| Operator must be positioned on seat to depress safety switches | |
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| (Model 68 DL only) | |
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| Mower will not move | Differential gear selector must be in one of the drive positions | |
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| Engine drive clutch must be engaged | |
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| Drive belts too loose (see "Drive Belt Tension" in Maintenance section) | |
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| Visually check to see that pulleys are not slipping on shafts | |
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| If everything above is OK, check for a damaged gear(s) in the differential | |
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| gear box | |
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| Mower will not stop | Ensure that the main clutch is disengaged (brake will not stop engine) | |
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| Brake adjustment or service may be needed. | |
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Cutting Units
Situation | Things To Check |
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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 chain may need tightening |
| Visually check that both the drive pulleys and the shafts are rotating |
|
|
Cutting units turn but | Reel bed knife position may be out of adjustment (see "Reel to Bed Knife |
will not cut | Adjustment" in Maintenance section) |
| Drive belts or drive chain may need adjustment. |
| Visually check that both the drive pulleys and the shafts are rotating |
|
|
Cutting units will not stop | Disengage all clutches |
turning |
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Uneven cut | 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 |
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