Instruction Manual
PES1513 Electric Power Unit - V1.1
www.durapac.com
Page 8 of 8
Problem
Cause
Solution
Application does not
fully extend (cylinder or
tools)
Reservoir overfilled
Secure load by other means.
Depressurise power unit and
hose, remove application, then
drain fluid to proper level
Low fluid level in power unit
reservoir
Secure load by other means.
Depressurise power unit and
hose, remove application, then
fill and bleed the system
Load above capacity of system
Use correct equipment
Application responds
slower than normal
Loose connection or coupler
Tighten couplers
Restricted hydraulic line or fitting
Clean and replace if damaged
Power unit not operating
correctly
Check power unit’s operating
instructions
Repair or replace as necessary
Low fluid level in power unit
reservoir
Secure load by other means.
Depressurise power unit and
hose, remove application, then
fill and bleed the system
Application responds to
pressurised fluid, but
system does not
maintain pressure
Leaky connection
Clean, reseal with thread
sealant, and tighten
connection
Leaking cylinder seals
Replace worn seals. Look for
excessive contamination or
wear. Replace contaminated
fluid
Power unit or valve not operating
correctly
Contact a Durapac authorised
service centre for repair
Overload condition
Remedy overload condition
Application does not
return fluid to power
unit (i.e. cylinder will not
retract)
Closed release valve
Secure load by other means.
Open release valve
Loose couplers
Secure load by other means.
Tighten couplers
Blocked hydraulic lines
Secure load by other means.
Clean and flush lines
Weak or broken retraction
springs
Secure load by other means.
Contact a Durapac authorised
service centre for repair
Internally damaged cylinder
Secure load by other means.
Contact a Durapac authorised
service centre for repair
Power unit reservoir too full
Secure load by other means.
Depressurise power unit and
hose, remove application, then
drain fluid to proper level
