Tennant 285, Руководство оператора

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MAINTENANCE
3-31
285 MM191 (12---89)
DISTRIBUTOR (For machines below serial number
010750)
The distributor operation is vital to the operation of
the engine. The following items should be carefully
inspected after every 400 hours of normal operation;
however, dirt, dust, water, and high speed operation
may cause more rapid wear and necessitate more
frequent inspections:
1. Remove the distributor cap. Clean the cap and
examine for cracks, carbon runners, or
corroded terminals. If the vertical faces of the
inserts are burned, install a new cap. If the
horizontal faces of the inserts are burned,
replace the cap and the rotor as this condition
is caused by the rotor being too short. Inspect
cap to distributor seal and the distributor
housing breather.
2. Check the centrifugal advance mechanism for
“freeness” by turning the breaker cam in the
direction of rotation and then releasing it. The
advance springs should return the cam to its
original position.
ENGINE IGNITION TIMING (For machines below
serial number 010750)
The engine ignition timing must be checked with a
timing light, using the timing points located on the
front of the engine and the timing marks located on
the crankshaft pulley. Distributor ignition timing
should be checked after the first 50 hours of
operation and after every 400 hours of operation
thereafter.
To check and adjust the ignition timing with a scope,
refer to the scope manufacturer’s instructions. To
check and adjust the timing with a timing light,
proceed as follows:
TO CHECK AND ADJUST IGNITION TIMING (For
machines below serial number 010750)
NOTE: Dwell angle must be correct or timing will not
be accurate.
1. Stop the engine and set the machine parking
brake.
FOR SAFETY: Before leaving or servicing
machine; stop on level surface, set parking brake,
and turn off machine.
2. Clean and mark the timing marks.
NOTE: Painting a white line on the front pulley timing
marks will make them more visible under the timing
light.
3. Disconnect and plug the vacuum hose from the
distributor.
A
B
00696
ENGINE TIMING MARKS
A. Timing Pointer
B. Crankshaft Pulley
4. Connect the timing light to the No. 1 cylinder
spark plug wire. Connect a tachometer to the
engine.
WARNING: Keep away from fan.
5. Start the engine and reduce the idle speed to
600 rpm to be sure that the centrifugal advance
is not operating. Adjust the initial ignition timing
to 6
_
BTDC on gasoline engines, and 10
_
BTDC on LPG engines.
To advance the timing, turn the distributor body
clockwise. To retard the timing, turn the
distributor body counterclockwise.
6. Check the centrifugal advance for proper
operation by starting the engine and
accelerating it to approximately 2000 rpm. If the
ignition timing advances, the centrifugal
advance mechanism is functioning properly.
Note the engine speed when the advance
begins and the amount of total advance. Stop
the engine.