Concentric 4F650 사용 설명서 및 부품 설명서 - 페이지 5
{카테고리_이름} Concentric 4F650에 대한 사용 설명서 및 부품 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. Concentric 4F650 7 페이지. Hydraulic gear pumps
페이지 인쇄
2690098
SYMPTOM
Pump does not
develop full pressure
Motor won't start
Will not pump oil
(Motor runs but cylin-
der does not move, or
moves slowly)
Pump motor unit is
noisy
Motor operating slow
or stalling
Motor speed is erratic
MODEL 4F649 THRU 4F659
Toubleshooting Chart
POSSIBLE CAUSE(S)
1. System relief valve set too low,
or leaking
2. Oil temp is too high
3. Pump is worn out
4. Double acting cylinder piston seals are
cut or worn out
1. Loose connection
2. Circuit breaker tripped
3. Voltage drop
4. Seized pump
5. Start up load is higher than motor
torque capability
1. No oil in reservoir
2. Motor rotating wrong direction
3. Oil level low
4. Suction strainer is clogged
5. Double acting cylinder piston seals are
cut or worn out
6. Reservoir breather is dirty or clogged
7. Bi-rotational check valve leaking
1. Low oil level
2. Air in system
3. Suction strainer or inlet filter is clogged
1. Excessive slipping of gears due to over-
heating of oil
2. Excessive wear on the sides of gear
housing due to oil contaminants
1. Motor operating below minimum
recommended speed of 750 RPM
2. Air in system
1. Check system relief valve for proper
setting with pressure gauge in outlet
line
2. Let oil cool below 140°F
3. Replace worn parts or pump
4. Replace or repair cylinder
1. Check wiring
2. Reset circuit breaker
3. Use heavier gauge wire
4. Replace pump
5. Use larger motor or reduce operating
pressure
1. Check oil level, refill
2. Change rotation of prime mover
or reverse inlet and outlet hoses
3. Add oil as needed
4. Clean suction strainer
5. Replace or repair cylinder
6. Clean reservoir breather and
reinstall
7. Remove check valve on pressure side.
Clean and reassemble.
1. Add oil as needed
2. Bleed air from highest fitting in system
by loosening fitting very slightly and
operating unit until bubbling of air
stops, then tighten
3. Clean suction strainer or inlet filter
1. Check system. Add oil if needed. Oil
cooler may be necessary to keep oil at
normal operating temperatures
2. Check condition of oil and replace if
contaminated
1. Increase minimum operating speed to
750 RPM or more
2. Bleed air from system
– 5 –
CORRECTIVE ACTION