ASTEC RT130, Operator'S Manual, Page: 42 / 64

ADJUSTMENT/MAINTENANCE
AU106984 G7B 38
VALVE ADJUSTMENT
Intake Valve Clearance (cold):................ 0.15 ±0.02 mm
Exhaust Valve Clearance (cold):.............. 0.20 ±0.02 mm
SPARK ARRESTER SERVICE
The spark arrester must be serviced every 100 hours to
keep it functioning as designed.
If the engine has been running, the muffler will be very
hot. Allow the muffler to cool before servicing the spark
arrester.
RT130014
1. Remove the two 8 mm nuts and remove the muffler
from the cylinder.
2. Remove the three 4 mm screws from the exhaust
deflector, and remove the deflector.
3. Remove the four 5 mm screws from the muffler
protector and remove the muffler protector.
4. Remove the 4 mm screw from the spark arrester, and
remove the spark arrester from the muffler.
RT130015
5. Use a brush to remove carbon deposits from the
spark arrester screen. Be careful not to damage the
screen. Replace the spark arrester if it has breaks or
holes.
6. Install the spark arrester, muffler protector, exhaust
deflector and muffler in the reverse order of
disassembly.
IDLE SPEED
Adjustment
RT130018
1. Start the engine and allow it to warm up to operating
temperature.
2. Move the throttle lever to its minimum position.
3. Turn the throttle stop screw to obtain the standard
idle speed.
Standard idle speed: 1,400 ±150 rpm
DIGGING CHAIN TENSION
Checking Tension
RT130046
Raise the boom until the bottom is parallel with the
ground.
Proper chain adjustment is achieved when the slack
between the digging chain (2) and the bottom of the
boom weldment (1) is at the proper proportion. For most
digging conditions, adjust the chain deflection to 25.4 mm
(1 inch). Dimension should be checked when chain is at
ambient temperature.
See the following to adjust chain tension.
1
2