Terex Genie 20N RJ, Service And Repair Manual

Page: 66 / 117

Service and Repair Manual September 2021
Manifolds
54 Z®-30/20N • Z®-30/20N RJ • Z®-34/22 • Z®-34/22N Part No. 1268498GT
7-4
Valve Coils
How to Test a Coil
A properly functioning coil provides an
electromotive force which operates the solenoid
valve. Critical to normal operation is continuity
within the coil that provides this force field.
Electrocution/burn hazard.
Contact with electrically charged
circuits could result in death or
serious injury. Remove all rings,
watches and other jewelry.
1 Tag and disconnect the wiring from the coil to
be tested.
2 Test the coil resistance.
Coils with 2 terminals: Connect the leads
from the ohmmeter to the valve coil terminals.
Coils with 1 terminal: Connect the positive
lead from the ohmmeter to the valve coil
terminal, then connect the negative lead from
the ohmmeter to the internal ring of the valve
coil.
Result: The resistance should be within
specification, plus or minus 30%.
Result: If the resistance is not within
specification, plus or minus 30%, replace the
coil.
Valve Coil Resistance
Specification
Note: The following coil resistance specifications
are at an ambient temperature of 68°F / 20°C. As
valve coil resistance is sensitive to changes in air
temperature, the coil resistance will typically
increase or decrease by 4% for each 18°F / 10°C
that your air temperature increases or decreases
from 68°F / 20°C.
Valve Coil Resistance Specification
Description
Specification
Solenoid valve, 3 position 4 way, 20V DC
(schematic items A, J, K, U, V, Y, AA, BB and
CC)
22 Ω
Proportional solenoid valve, 24V DC
(schematic item H)
19.5 Ω
Solenoid valve, N.C. poppet, 20V DC
(schematic item M)
23.5 Ω
Solenoid valve, N.O. poppet, 20V DC
(schematic item P)
23.5 Ω