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SYMPTOM
Inadequate or no flow from
pump
Pump till not build pressure
Pump is running hot
Noisy pump or system
Pump will not prime or loses
prime
905050
CAUSE
Inlet line is above fluid level
Air in suction pump
Pump not primed
Broken drive shaft or coupling
or loose coupling
Oil viscosity is too high
Dirty or clogged oil suction
filter
Broken piston return spring
(item NN) or check valve
spring (item DD)
Loose check valve seat
retainers (items BB)
System relief valve stuck
open
System relief valve constantly
spilling
Duty cycle excessively at high
pressure
Air in system
Pump cavitation
Coupling misaligned
Broken piston return spring
(item NN)
Loose piston shoe (item L)
Loose cylinder locking screws
(items W)
Worn or damaged shaft seals
(items C or AC)
Faulty O-ring (items V, MM,
TT, or AB)
Air in suction
29
Dake Corporation
724 Robbins Road
Grand Haven, MI 49417
www.dakecorp.com
SOLUTION
Check fluid level and provide
adequate fluid to fill entire
system
Check for loose inlet line
connections
Fill pump cast with Mobil DTE
24 or equivalent and run until
pump picks up prime
Replace broken parts and
tighten setscrews in coupling
Use proper viscosity fluid for
operating temperature
conditions
Clean filter and check at least
once a month
Replace broken parts and
reassemble
Retighten loose parts, use
thread-locker when
retightening
Check valve for
contamination
Check relief valve setting and
work cycle
Install oil cooler on fluid
reservoir
Bleed all circuit trapped areas
Check for restriction in pump
inlet or for loose fittings in
inlet line
Realign couplings
Replace broken parts and
reassemble
Replace with new parts
(items L & M)
Tighten screws
Replace with new parts
Replace with new parts
Check for loose fittings and
tighten
REV112019
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