Troy-Bilt 640C-Tuffy Benutzerhandbuch

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4. Check for correct tension on the forward 
drive belt by taking two measurements of 
the cable spring, as follows:

a. With the Forward Clutch Bail (Y, Fig. 2-
6) in an open (released) position, measure 
the length of the cable spring (W) from the 
outermost coil to the outermost coil.

b. Squeeze the Forward Clutch Bail against 
the handlebar (see Fig. 2-7) and re-mea-
sure the spring length. The belt tension is 
correct if this second measurement is be-
tween 1/16" to 3/16" longer than the first 
measurement. If so, turn the hex nut (Z, 
Fig. 2-7) tightly against the cable adjuster 
(X) while preventing the cable adjuster 
from turning.

c. If the spring length is incorrect, you 
must adjust the cable tension as described 
in Checking and Adjusting Forward Drive 
Belt Tension in Section 5. Incorrect cable 
tension can result in belt slippage (cable 
tension too loose), or unintentional tine 
movement when the clutch bail is in Neu-
tral (cable tension too tight).

1. Unwrap the reverse clutch cable (CC, 
Fig. 2-8 and Fig. 2-9) from its shipping po-
sition and route it up to the handlebar. Be 
sure that the cable is routed beneath the 
Forward Clutch Bail.

2. Insert the cable (CC, Fig. 2-8) through the 
slot in the cable bracket and position the flat 
side of the threaded assembly next to the 
flat side of the hole. Slide the hex nut (DD) 
up the cable and tighten it securely. 

3. Fasten the reverse clutch cable to the 
left side handlebar with a cable tie (EE, Fig. 
2-9). 

4. Test the function of the reverse clutch by 
pulling out and releasing the cable knob. 
The knob should return to its neutral posi-
tion (resting against bracket). If it doesn’t, 
contact your local dealer or Troy-Bilt LLC 
for technical assistance.