S.D.P. EZ Hauler 4100, Manual

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Chapter 3 Parts 49
EZ Hauler 4100 Control Valve Troubleshooting Guide
Theory of Operation
– The control valve for the EZ Hauler 4100 includes three sections:
1 Mid-inlet section
2 To the right of the mid-inlet section:
1. Five 4-GPM four-way, three-position valve sections.
2. These five valve sections control Boom Lift, Boom Extend, Winch, Auxiliary, and Rotation
3 To the left of the mid-inlet section:
1. One 13-GPM four-way three-position valve section
2. This section controls the Auger function
To the left of the Auger Section is an end section containing an inlet gage port (MP), a pilot
pressure gage port (PPG) and two mounting holes. All valve sections are individually pressure
compensated. The 4 GPM sections use a screw in cartridge pressure compensator set at 290
PSI. The 13 GPM section uses a slip-in compensator that is also set at 290 PSI. All valve
sections are electro-hydraulically operated with a lever type manual override. Each electro-
hydraulic valve actuator uses two proportional flow control valves along with a Hall Effect
position transducer and onboard electronics to precisely control spool position. The input signal
is a voltage signal with neutral at 2.5 volts. The mid inlet contains a bypass compensator (CP3),
a load sense orifice, a compensator decompression orifice, a pilot relief valve (VS) that controls
the inlet compensator, a pressure reducing valve (RPM) set at 290 PSI to supply pressure to the
proportional flow control valves and a control disable solenoid valve (EV9) that interrupts
pressure to the proportional valves. The bypass compensator is controlled by the individual
valve sections through a load sense shuttle logic. A cartridge shuttle is located in each valve
section.
Control Requirements - Each electro-hydraulic valve actuator has a four-pin connector. Pin call-
outs are included in the following chart.
PIN NUMBER DESIGNATION COMMENT
1 Power 9 to 30 volts with E-stop enabled. 0 volts with E-stop
disabled.
2 Ground
3 Signal Neutral - 2.5 +/- 0.1 Volts
Maximum Stroke A - 4.1 Volts (DO NOT exceed 4.75
Volts)
Maximum Stroke B - 0.9 Volts (DO NOT drop below
0.25 Volts)
4 5 Volts Out Not used