
15
Fluid leaking at Pump Assembly
Hydraulic fittings not torqued
properly (too tight, too loose)
Refer to Dealer
O-Rings between valve block and
endhead are cut or not seating
properly
Refer to Dealer
O-Rings between endhead and
reservoir cut or not seating properly
Refer to Dealer
Reservoir over-full
See Maintenance Section
O-Ring on solenoids or pressure
switches defective
Refer to Dealer
Endhead cracked
Refer to Dealer
Valve body cracked
Refer to Dealer
Unit lifts but does not hold - first
action
Dirt in check valve or Float/DP
solenoid valve
Cycle raise and lower system to flush
debris
Float/DP solenoid valve sticking
Cycle raise and lower system to un-
stick valve
Unit lifts but does not hold -
second action
Dirt or debris in check valve
Refer to Dealer
Check valve spring broken
Refer to Dealer
Float/DP solenoid valve sticking
Refer to Dealer
Seals O-Ring(s) on Float/DP
solenoid valve damaged
Refer to Dealer
Raise/lower ram defective
Refer to Dealer
Machine failure
Refer to Dealer
Unit will not lower
NOTE: Only in non- down pres-
sure mode
Plugged breather cap
See Maintenance Section
Low or no current available at Float/
DP Solenoid
Refer to Dealer
Float/DP solenoid valve sticking
Refer to Dealer
Float/DP solenoid coil defective
Refer to Dealer
Raise lower ram defective allowing
movement in one direction only
Refer to Dealer
Machine failure
Refer to Dealer
PROBLEM
PROBABLE CAUSE
CORRECTIVE ACTION
Summary of Contents for 28V Series
Page 26: ...25 NOTES...
Page 28: ...27 HYDRAULIC SCHEMATIC GRAVITY...
Page 29: ...28 HYDRAULIC SCHEMATIC DOWN PRESSURE...
Page 30: ...29 WIRING SCHEMATIC GRAVITY...