Denison Hydraulics Goldcup 6, Инструкция по установке и капитальному ремонту, Страница: 7 / 24

TROUBLESHOOTING
TROUBLESHOOTING
(continued)
Effect of Trouble Possible Cause Fault which needs remedy
Improper repair Incorrect parts
Incorrect procedures, dimensions, finishes High wear in motor
(continued)
Unwanted water
In fluid Condensation
Faulty breather/strainer
Heat exchanger leakage
Faulty clean-up practice
Water in make-up fluid
Cogging load Mechanical considerations
Worn relief valve Needed repairs
Worn
compensator
Show response in
check valves Needed repairs
Replace or relocate
Servo pressure to
low to maintain
firm control Increase pressure and check
pressure drop through servo filter
Excessive de-
Compression
energy rates Improve decompression control
Excessive line
capacitance
(line volume,
line stretch,
accumulator
effects) Reduce line size or lengths
Eliminate hose
Bleed air
Pressure shocks
Barrel blow -off Re-check pump hold-down, rotating group,
drain pressure
Excessive motor
leakage Recheck case drain flow and repair as required
Fluid too thin
Improper assembly, port timing
Relief Valve Set too low (compared to load or to
compensator)
Instability caused by back pressure, worn parts
Compensator Set too high (compared to relief)
Worn parts
Pump too large
for fluid needs Select smaller pump displacement
Heat exchanger Water turned off or too little flow
Water too hot
Fan clogged or restricted
Efficiency reduced by mud or scale deposits
Intermittent hydraulic fluid flow
Heating of fluid
Reservoir Too little fluid
Entrained air in fluid
Improper baffles
Insulating air blanket that prevents heat rejection
Heat pick-up from adjacent equipment
6