Kohler Command CH20 Service Manual page 29

Vacuum lock-off mechanism is located in secondary
chamber. When engine is running, manifold vacuum
above diaphragm draws it up, so secondary valve can
function normally. When engine is stopped, manifold
vacuum is terminated, and diaphragm relaxes and
pushes down on secondary valve lever, preventing any
fuel fl ow or leakage through regulator.
Preventative Maintenance
Regulator is preset at factory and generally requires no
further adjustment. No periodic service is required. Over
time, depending on fuel quality, operating environment,
and system performance, fuel deposits can accumulate
inside regulator. For Nikki regulators, perform following
steps to remove any accumulated deposits.
1. Turn supply valve off , run engine out of fuel, and turn
off ignition switch.
2. Disconnect and ground spark plug leads.
3. Remove 1/8 in. pipe plug from bottom of regulator
and drain any accumulated deposits.
4. Reinstall plug using pipe sealant with Tefl on
(Loctite PST 592™ Thread Sealant or equivalent)
® ®
on threads and tighten securely. If required, a
replacement plug can be found at
KohlerEngine.com.
Regulator Service
It is recommended that disassembly, cleaning, and
resetting of regulator be performed using regulator
rebuilding kit available at KohlerEngine.com. Specifi c
instructions are included in rebuilding kit. Perform
regulator service following instructions provided. As all
adjustments and settings must be reset using specifi c
test equipment, this must be performed by qualifi ed
LPG/NG personnel only.
24 690 30 Rev. G
®
KohlerEngines.com
Fuel System
29