REPAIR & ADJUSTMENTS
All repairs and adjustments should be performed by a qualified carbon dioxide equip-
ment service technician. The following applies to all single pump machines.
HIGH-LOW PRESSURE COMPENSATOR ADJUSTMENT
The high-low pressure compensator will provide the highest possible pump flow until a
preset pressure is reached. The pump then de-strokes to provide a minimum preset flow
rate regardless of system pressure. The high-low pressure compensator is preset at the
factory but may need to be adjusted, particularly after pump repair or replacement. The
high-low pressure compensator must be adjusted properly to provide satisfactory pump
operation.
1. Disconnect electrical power and follow your company’s lock out and tag out safety
procedures.
2. Using a 9/16” wrench, loosen the high-low pressure compensator adjustment bolt
locknut by turning it counterclockwise.
3. Turn the high-low pressure compensator adjustment bolt counterclockwise by hand
until it is completely removed.
4. Reinstall the high-low pressure com-
pensator adjustment bolt, very gently
turning it by hand until it makes con-
tact with the internal compensation
spool.
5. Turn the adjustment bolt 1/4 turn
clockwise, slightly compressing the
compensation spool.
6. Hold the adjustment screw to prevent
it from turning and tighten the lock-
nut.
6.1
HYDRAULIC PUMP
CONTROL BODY
PRESSURE COMPENSATOR
ADJUSTMENT BOLT
PRESSURE COMPENSATOR
ADJUSTMENT BOLT LOCKNUT
Figure 6.1 - High-Low Pressure
Compensator Adjustment
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