Great Plains Electric Hydraulic Boom Solenoid Operator Manual 1995+ - Manual (Page 20)

Electric Hydraulic Boom Solenoid
500-089M 4/17/2003
18
Problem Solution
The solenoids won’t function and there
is no power to the solenoids when the
switches are actuated. Check to see if the fuse is blown in the battery terminal harness. If the fuse is
good, check the electrical connectors on the harness. If they are connected, trou-
ble shoot the wiring using Figure 1 or Figure 10 depending on what control box
you have.
The solenoids won’t function and there
is power to the solenoids when the
switches are actuated. Check to see if the coil is working by placing a wrench above the coil nut. If it is
magnetized, the coil is okay and the valve isn’t operating properly. If the valve isn’t
operating, it is due to contamination or the fact that the coil was tightened to tight.
The coil is bad when there is power to the solenoid but there is no magnetism.
Hydraulic valves are operating when
switches are not on. Check the hydraulic solenoids to see if they are actuated by placing a wrench on
top of the solenoid nut. There should be no magnetism if the solenoids are not
actuated. If the solenoid is magnetized, the coil is energized and there is an elec-
trical problem. If the coils aren’t energized, there could be a contamination prob-
lem, some damaged o-rings, or some damaged back-up rings.
The hydraulics work in the wrong direc-
tion. Move the hydraulic lever in the tractor to the forward position. Check the hydraulic
hose hook-up. The short cylinder diagram on the tractor outlet should connect to
the “P” port on the solenoid or the “V2” port on the bypass valve (if equipped).