FOR MODELS: JGW, JGR AND JGJ SECTION 5 - MAINTENANCE
PAGE 5 - 38 1/01
the VVCP can be adjusted when the cylinder is pressurized, but difficult to turn when the cyl-
inder is vented. This problem is corrected by disassembling the VVCP and cleaning.
To adjust the volume, loosen the stem locking handle, so that stem is free to turn. Turn the
stem by use of the hand wheel on the outboard end of the shaft. Turn hand wheel clockwise
to load; counterclockwise to unload. Re-tighten the stem locking handle to 150 lbs-ft (203
Nm) torque.
FIGURE 5-21: CYLINDER WITH VVCP - TYPICAL
Compressor
Cylinder
Compressor
Piston & Rod
Assembly
VVCP
Assembly
VVCP
Packing
VVCP
Packing
Vent
Grease
Fitting
Stem &
Piston
Hand
Wheel
Thread
Protector
Bellows
Locking
Handle
O-Ring
Trapped
Gas
Pressure
VVCP Piston Ring
(not gas tight seal)
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