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Installation, Operation and Maintenance Manual
DOC.IOM.RG.US Rev. 11
Section 14:
Of all the system components the operator itself is the least likely to malfunction and requires the
most time and effort to service. For this reason, a thorough effort should be made to pinpoint the
source of trouble before proceeding with operator service.
Completion of the operational test steps in Section 7 should confirm operation or indicate the most
likely source of a problem.
Table 10.
Problem
Slow jerky or partial stroke on
manually controlled gas
powered
Slow or no operation with
handpump
Fluid leaking from drive case
vents - ROTARY
Fluid leaking from cylinder
plate - GVO
Fluid leaking from END STOP
COVER SEAL
Excessive amounts of fluid
from/with exhaust
Troubleshooting
Troubleshooting
Troubleshooting Guide
Possible Causes
- Low supply pressure
- Shutoff/speed control closed
- Dirty gas filter element resulting
in insufficient flow and pressure
to stroke operator
- Contaminated fluid; will not flow
easily through lines
- Operator and valve stops not
in same position
- Tank fluid levels low
- Pump suction or discharge
check valve malfunction
- Speed control or locking
valve blockage/malfunction
- Dirt, ice in fluid lines
- Damaged rod seal
- Damaged seal
- High tank levels
- Blow by across piston
Section 14: Troubleshooting
November 2021
Remedy
- Check and increase
- Check and open a few turns
- Blow out lines
- Disconnect operator from valve if possible
- Refer to Section 7
- Make up levels with aviation grade
hydraulic fluid (per customer specification)
- Remove tubing at cylinder
- Check for flow when handpump operated
- Refer to Section 2
- Check oil levels
- Manual operation with handpump
- Refer to Sections 10 to 12
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