Bolens 645A サービスマニュアル

2.  When installing a single tine, be sure to position it so 

that its cutting edge (sharp) will enter the soil first as 
the tiller moves forward.

C. Removing/Installing a Tine Assembly:
1.  A tine assembly consists of eight tines mounted on a 

tine holder.

2.  If removing both tine assemblies, mark them “left” 

and “right” before removal. Remove the screw (C, 
Figure 5-3) and locknut (D) that secure the tine 
assembly to the tine shaft. If necessary, use a rubber 
mallet to tap the tine assembly outward off the shaft.

3.  Before reinstalling the tine assembly, inspect the 

tine shaft for rust, rough spots or burrs. Lightly file or 
sand, as needed. Apply a thin coat of grease to the 
shaft.

4.  Install each tine assembly so that the cutting (sharp) 

edge of the tines will enter the soil first when the tiller 
moves forward. Secure the tine assembly to the tine 
shaft using the screw and locknut 

It is important to maintain correct tension on the forward 
drive belt. A loose belt will cause the tines and wheels 
to slow down — or stop completely — even though the 
engine is running at full speed. A too tight belt can result 
in unintentional tine movement when the clutch bail is in 
the Neutral (released) position.
•  Check belt tension after the first two hours of break-

in operation and after every 10 operating hours.

•  At the end of each tilling season, check the belt for 

cracks, cuts or frayed edges and replace it as soon as 
possible. 

To Check Forward Belt Tension:
1.  Stop engine, wait for all parts to stop moving and 

disconnect spark plug wire.

2.  With the Forward Clutch Bail in an open (released) 

position, measure and note the overall length of the 

cable spring (A, Figure 5-4) by measuring from the 

outermost coil to the outermost coil.

3.  Squeeze the Forward Clutch Bail against the handle-

bar (see Figure 5-4) and   re-measure the length of 

the coils. The belt tension is correct if this second 

measurement is between 1/6” -to- 3/16” longer than 

the first measurement.

4.  If the spring is too short (less than 1/16”), the tension 

is too loose. If the spring is too long (more than 3/16”), 

the tension is too tight.

5. To adjust the length of the spring: 

a.  Release the Forward Clutch Bail.
b.  Unthread the hex nut (C, Figure 5-4) halfway up the 

adjustment screw (D). 

c.  Unhook the top of the spring from the Forward 

Clutch Bail.

d.  Use pliers to prevent the adjuster (B) from turning 

and turn the slotted screw located inside the spring 

clockwise (viewed from operator’s position) to 

increase tension on the spring. Turn the screw 

counterclockwise to decrease tension. Once 

adjusted, reattach the spring to the Forward Clutch 

Bail.

Figure 5-3: Install tines so that cutting edge of tines enter soil first when tiller moves forward.