50 EZ Hauler 4100 Manual Part # 99903718
The control disable solenoid valve (EV9) requires a nominal 12 volt signal to enable operation of
all functions. Voltage should be 0 volts when disabled. Manual operation of the control valve
does not require the control disable solenoid valve to be energized.
General Troubleshooting
Before beginning to troubleshoot the crane hydraulics, verify that the manual selector valve is in
the crane position, that controls are enabled and that the engine is running. All six control valve
functions have the same general internal configuration and share the same inlet valving. The
initial diagnostic procedure applies to all six valve sections. It is followed by individual diagnostic
procedures for functions that contain additional valving (I.E. counterbalance valves, pilot
operated check valves, etc).
FUNCTION / ISSUE
ACTION
ALL
1. Check and/or adjust main relief valve setting at port MP located on the far left
side of the manifold. (Pressure setting - 2500 psi -0/+100 psi) The relief valve is
located in the mid-inlet section.
2. Check if any other functions operate manually. If no functions operate manually,
a. Check/clean load sense orifice
b. Check inlet compensator (CP3) for contamination. Clean or replace.
c. Diagnose lower hydraulics.
Operate valve
section with
manual lever. If
function does
NOT operate
using manual
lever:
3. Check load sense pressure at port MLS in the mid-inlet section. If the pressure
does not increase when the function is operated, clean or replace the function load
sense shuttle.
1. Check the control disable solenoid valve (EV9) for power during function
operation. If there is no power to the EV9 solenoid valve during winch operation,
check the radio controller and electrical system.
2. Check the valve section 4-pin connector (Pins 1,2, and 3) for proper function.
See the
Control Requirements
section for required values. If pins do not have
proper values, check the radio controller and electrical system.
Function will not
operate in either
direction.
If the function
operates
normally using
the manual lever,
but does not
operate electro-
hydraulically :
3. If values are correct for EV9 solenoid valve and Pins 1,2, and 3:
a. Check the pilot pressure to the proportional valves at port PPG, located on the
far left side of the manifold. (290 psi when the EV9 is powered; 0 psi when the EV9
is de-energized.
b. If there is no pressure at PPG when the EV9 is energized:
i. Check/replace the EV9 coil (approximately 6 Ohms).
ii. Clean/replace the EV9 solenoid valve.
c. Clean the valve section proportional valves. Verify free spool movement by
gently pushing on the spool through the nose of the cartridge.
d. Replace the proportional driver valve section.
WINCH
Winch will not operate in either
direction.
1. Check winch counterbalance valve, shuttle valve, and PO check valve for
contamination. Clean or replace.
BOOM EXTEND
Extend cylinders will not retract.
1. Check extend counterbalance valves for contamination. Clean or replace.
BOOM LIFT
Boom lift cylinder will not retract.
1. Check boom lift counterbalance valve for contamination. Clean or replace.
Summary of Contents for EZ Hauler 4100
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Page 13: ...Chapter 2 Specifications 11 Geometric Configuration 28 10 5 11 41 4 4 3 4 5 8 35 7 34 4 ...
Page 27: ...Chapter 3 Parts 25 Valvebank 70733995 Drawing not available at time of printing ...
Page 30: ...28 EZ Hauler 4100 Manual Part 99903718 Boom Assemblies Cylinders BoomAssembly 99903706 ...
Page 44: ...42 EZ Hauler 4100 Manual Part 99903718 Hydraulics Hydraulic Layout 99903715 ...
Page 47: ...Chapter 3 Parts 45 Hydraulic Schematic 99903702 ...
Page 61: ...Chapter 3 Parts 59 Wiring Schematic Radio Remote 99903721 2 ...
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Page 75: ...Chapter 4 Crane Reference 73 X R CA ITEM EXPLANATION DATE CORRECTED ...
