Preventive Maintenance - Bolens HT-20 Manual

P R E V E N T I V E M A I N T E N A N C E
A little time spent by the operator on preventive
maintenance each day the unit is used will lead to longer
operating life of the B O L E N S tractor.
The removal of debris, dirt and grease accumulations are
considered normal maintenance practices and can help
discover minor difficulties before they become trouble-
some.
LUBRICATION
See Lubrication Chart on page 24.
ENGINE
The engine oil level must be maintained in the " s a f e "
operating range at all times. Oil level must be between the
" L " (low) and " F " (full) marks on the dipstick. Clean
area around dipstick so dirt does not fall into crankcase
when dipstick is removed. Check daily and add oil as
necessary to maintain proper level — D O N O T O V E R -
F I L L Oil level must not exceed the " F " mark. After
completely draining oil, reinstall drain plug then remove
oil filler cap and refill with 4 quarts of oil — check the
oil level on the dipstick before adding more — then bring
the level up in the safe range. If the oil filter has been
changed, add one additional pint (half quart) of oil.
Select oil weight and type according to outside temper-
ature. Refer to Lubrication Chart on page 24.
OIL F I L T E R
The filter is mounted on the crankcase of the engine. See
Figure 8, page 8. These are " t h r o w a w a y " cartridge type
filter elements. If the cartridge has been overtightened
during installation, a strap wrench may have to be used to
remove it but usually it can be removed by hand. Use the
following procedure to replace:
1. Drain crankcase o i l .
2. Place rags or a pan below the cartridge to catch spilled
oil. Unscrew the cartridge counterclockwise and discard.
3. Wipe up any spilled oil, then wipe the adapter clean.
4. A p p l y grease on oil filter gasket then turn new cartridge
(with gasket in place) onto the adapter in clockwise
direction — hand tighten only.
5. After replenishing oil and restarting engine, check area
around cartridge for signs of oil leakage. Correct leakage if
need be by turning cartridge tighter.
Failure to change oil filter elements at the recommended
intervals can lead to serious damage to the engine. A n oil
filter does a very effective job; however, it must be
replaced e a c h 1 0 0 h o u r s of operation (every other oil
change) under normal conditions or more often if the
engine is subject to extremely dirty conditions.
N O T E : U S E O N L Y T H E G E N U I N E K O H L E R O I L F I L -
T E R C A R T R I D G E F O R R E P L A C E M E N T .
AIR C L E A N E R
Under normal operating conditions, disassemble and ser-
vice air cleaner components every 50 hours of operation.
Do this more frequently (even daily) if extremely dusty
or dirty conditions prevail. The dry type element is
cleaned by gently tapping on a flat surface — when doing
this, be careful not to damage gasket surfaces on element.
D o n o t attempt to clean dry type elements in any liquid
or with compressed air as this will damage paper filter
material. Wipe dirt or dust accumulation from cover
including base plate where used.
Figure 18
Dry type elements should be replaced after each 100 to
200 hours — replace at 100 hours if engine is operated
under dirty conditions — replace every 200 hours under
good clean air conditions.
The importance of maintaining an air cleaner in proper
condition cannot be overemphasized! Dirt induced
through improperly installed, improperly serviced or in-
adequate elements, wears out more engines than does long
hours of operation.
N O T E : A F O A M P R E - C L E A N E R IN A D D I T I O N T O T H E
A I R C L E A N E R E L E M E N T IS A V A I L A B L E
F R O M Y O U R K O H L E R D E A L E R F O R S E V E R E
D I R T C O N D I T I O N S .
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