Bolens 645A 서비스 매뉴얼

Check the transmission gear oil level after every 30 hours 
of operation or whenever you notice any oil leak. Operat-
ing the tiller when the transmission is low on oil can result 
in severe damage.
A. To Check the Transmission Gear Oil Level:
1.  Check the gear oil level when the transmission is cool. 

Gear oil will expand in warm operating temperatures 
and this expansion will provide an incorrect oil level 
reading.

2.  With the tiller on level ground, pull the Depth Regula-

tor Lever all the way up.

3.  Remove the oil fill plug (A, Fig. 5-2) from the transmis-

sion housing and look inside the oil fill hole to locate 
the main drive shaft situated below the hole.

4.  The gear oil level is correct if the gear oil is approxi-

mately halfway up the side of the main drive shaft.

5.  If the gear oil level is low, add gear oil as described 

next. If the gear oil level is okay, securely replace the 
oil fill plug.

IMPORTANT: Do not operate the tiller if the gear oil 
level is low. Doing so will result in severe damage to the 
transmission components. 
6.  If adding only a few ounces of gear oil, use API rated 

GL-4 or GL-5 gear oil having a viscosity of SAE 140, 
SAE 85W-140 or SAE 80W-90. If refilling an empty 
transmission, use only GL-4 gear oil having a viscosity 
of SAE 85W-140 or SAE 140.

IMPORTANT: Do not use automatic transmission fluid or 
motor oil in the transmission.
7.  While checking frequently to avoid overfilling, slowly 

add gear oil into the oil fill hole until it reaches the 
halfway point on the drive shaft. 

8.  Securely replace the oil fill plug.
B. To Drain the Transmission Gear Oil:
The transmission gear oil does not need to be changed 

unless it has been contaminated with dirt, 
sand or metal particles. 
1. Drain gasoline from the fuel tank or run 
the engine until the fuel tank is empty. See 

“DANGER” statement below.

WARNING: Gasoline is highly flammable and its 
vapors are explosive. Follow these safety practices 
to prevent personal injury or property damage from 
fire or explosion.
•  

2.  Drain the oil from the engine.
3.  Remove four screws (B, Figure 5-2) and remove 

transmission cover and gasket.

4.  Remove the left-side wheel.
5.  Tilt the left-side wheel shaft into a drain pan and allow 

the gear oil to drain through the top of the transmis-
sion.

6.  Reinstall the wheel.   
7.   Install a new gasket (do not reuse old gasket) and 

reinstall the transmission cover. 

8.  Refill the transmission using GL-4 gear oil (SAE 

85W-140 or SAE 140).

9.  Refill the engine with motor oil and replenish the fuel 

tank with gasoline.

The bolo tines will wear with use and should be in-
spected at the beginning of each tilling season and after 
every 30 operating hours. The tines can be replaced 
either individually or as a complete set. See the Parts 
List pages for tine identification and part numbers.
A. Tine Inspection:
With use, the tines will become shorter, narrower and 
pointed. Badly worn tines will result in a loss of tilling 
depth, and reduced effectiveness when chopping up and 
turning under organic matter. 
B. Removing/Installing a Single Tine:
1.  With the engine shut off and the spark plug wire 

disconnected, remove the two screws (A, Figure 5-3) 
and nuts (B) that attach a single tine to a tine holder. 
If needed, use penetrating oil on the nuts.