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7 Troubleshooting and Maintenance
7.1
Pressure
Table 7-1
Symptom
Pump runs, but pressure
does not increase
Pump does not run
Frequent pumping
Will not vent pressure
101625591
Pressure
Possible Cause
Fluid level in pressurizing fluid
reservoir lower than pickup tube
Excess air in hydraulic system
Rupture disc burst
Blocked suction line filter
No air supply
Faulty electronic air pressure
regulator or pump
Leaking cell cap, cell bottom, or port
connector O-rings
Dump valve or control valve not
seating
Leaking fittings
No air supply
Faulty air operated relief valve, air
pressure regulator, or air operated
control valve
Blocked high-pressure filter
Blocked flow-restriction tubing
iX77™ Rheometer User Manual
Revision F
Solution
Fill pressurizing fluid reservoir
Purge air using manual release valve
Observe for continuous fluid return
in waste bottle with manual release
valve closed; replace rupture disc
Replace filter or filter element
Verify air supply
Call for FANN service
Inspect connections for leaking
fluids and replace O-rings as
indicated
Manually reset dump valve
Replace kit in control valve
Inspect weep holes at all high-
pressure fittings and tighten as
indicated
Verify air supply
Call for FANN service
Slowly manually release pressure,
remove filter, and clean or replace
filter elements
Disassemble, clean, and reassemble.
Do not over tighten high-pressure
fitting.
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