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Recommended procedures for a low
emissions tune-up for propane (LPG) powered forklifts.
CARBURETOR ADJUSTMENT PROCEDURE
Pre-adjustment Check List
- Be sure the air filter is clean and
installed.
- Check the timing and adjust to manufacturer's
specifications.
- Check to insure the idle RPM is set at
factory specified speed.
- The engine must be at operating temperature.
 Idle
Adjustment Procedure
- At idle, CO in the exhaust pipe should be
between 0.4% and 0.7%.
- Turning the idle mixture screw in (richer)
will raise the CO.
- Turning the idle screw out (leaner) will
lower the CO.
Power Adjustment Check List
- Set the parking brake and block the drive
wheels.
- Bring the engine to full governed RPM.
- Tilt the mast back until the hydraulic pump
reaches relief bypass.
- Check for proper operation of the hydraulic
bypass (RPM drop).
Power Adjustment Procedure
- With the engine operating at the hydraulic
relief bypass, CO levels in the exhaust pipe should be between
0.4% to 0.7%.
- Turning the power mixture valve toward R
(rich) raises the CO.
- Turning the power valve toward L (lean) will
lower the CO.
- These CO levels are general limits where most
engines operate well. The best source of these levels is the
factory specifications for each particular engine and carburetor
combination. Always refer to the OEM's specifications for CO
exhaust emissions.
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