Cascade E-Series - Clamp Function; Supply Circuit Test; Clamp Circuit Test

20 215204 Rev. 1
ROUBLESHOOTING
T
4.3 Clamp Function
There are five potential problems that could affect the
CLAMP function:
• Incorrect load handling. Refer to the Operator’s Guide
for suggested procedures.
• Incorrect hydraulic pressure or flow from the lift truck.
• External leaks.
• Defective solenoid coil or valve (if equipped).
• Worn/defective cartridge valves or cylinder seals.
4.3-1 Supply Circuit Test
1 Check the pressure supplied by the truck at the carriage
hose terminal. Pressure must be within the range shown
in Specifications, Section 6.1. PRESSURE TO THE
CLAMP MUST NOT EXCEED 2600 PSI (180 bar).
2 Check the flow volume at the carriage hose terminal.
Flow must be within the range shown in Specifications,
Section 6.1.
3 Close the arms fully, holding the lever in the CLAMP
position for a few seconds. Release the lever and check
for external leaks at fittings, hoses, valve and manifold.
4.3-2 Clamp Circuit Test
1 Press the solenoid button (if equipped) and listen for a
'click' at the solenoid valve. If no sound is heard, first
check the fuse, wiring and coil. Assure that the valve is
not jammed (see Section 4.5).
IMPORTANT: Solenoid-operated valves must be
plumbed so that the solenoid is energized during the
CLAMP/RELEASE function.
2 Open and close the arms fully. If the arms move slowly
or not at all, the CLAMP relief cartridge (see illustration
next page) may be faulty. Replace the cartridge. If the
arms move unequally, the FLOW DIVIDER cartridge
(see illustration next page) may be faulty. Replace
the cartridge.
3 Position the arms to mid-stroke. Turn the truck off and
connect a 3500 psi (240 bar) pressure gauge to the
TEST port on the main valve.
4 Start the truck and close the arms fully, holding the lever
in the CLAMP position for a few seconds.
WARNING: Before removing hydraulic
lines or components, relieve pressure in the
hydraulic system. Turn the truck off and
open the truck auxiliary control valves
several times in both directions.
CL0435.ill
CL0423.ill
Pressure Gauge
on TEST port
Flow Meter
3
2
4
Back View
Front View