ZENAIR CH2000 SERVICE MANUAL
________________________________________________________________________
VACUUM REGULATOR VALVE - Fig. 22
One vacuum regulator valve is incorporated in the system to control vacuum pressure to
the gyro instruments. The regulator valve is located under the instrument panel, access to
the valve for maintenance and adjustment is gained from below the instrument panel.
ADJUSTMENTS OF VACUUM REGULATOR VALVE
Unlock the nut under the Regulator valve, and turn the adjusting screw to obtain the
proper vacuum. Safety after adjustment.
TROUBLE SHOOTING OF VACUUM SYSTEM See following table:
VACUUM SYSTEM
Trouble
Cause
Remedy
No vacuum pressure gauge
indication.
Pump inoperative.
Disconnected. Broken or
restricted lines.
Replace pump. Locate
trouble and correct.
No vacuum pressure gauge
indication at instrument.
Hose from instrument to
gauge leaking or restricted.
Check all lines and
connections.
No vacuum suction gauge
indication at either
instrument or source.
Faulty gauge.
Malfunctioning, regulator
valve, or vacuum pump.
Check operation of
instruments. If operation is
normal, replace gauge. If
instruments are inoperative,
check operation of vacuum
pump or regulator valve.
Low vacuum system
pressure.
Vacuum regulator valve
incorrectly adjusted.
Leaking of the system lines
or fitting.
Adjust regulator valves in
accordance with
(Adjustments) of this
section.
Check all lines and fittings.
Normal pressure indication,
but sluggish operation of
instruments.
Instruments air filter
elements dirty.
Remove and clean or
replace.
High system pressure.
Vacuum regulator valve
incorrectly adjusted.
Vacuum regulator valve
sticking or dirty screen.
Adjust in accordance with
“Adjustments” as per
above.
Clean and check operation
of regulator valve.
3 Apr 95
9.9
