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April 2017
Service and Repair Manual
Manifolds
Part No. 1278145
GTH-1056
73
7-9
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.
Since coil resistance is sensitive to temperature,
resistance values outside specification can produce
erratic operation. When coil resistance decreases
below specification, amperage increases. As
resistance rises above specification, voltage
increases.
While valves may operate when coil resistance is
outside specification, maintaining coils within
specification will help ensure proper valve function
over a wide range of operating temperatures.
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.
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, 2 position 4 way 12V DC
with diode (schematic items AA, AD, AY,
AAB and BAA)
8.9Ω
Solenoid valve, 2 position 2 way 12V DC with
diode (schematic items AAC and EA)
8.9Ω
DO3 valve, 3 position 4 way 12V DC with
diode (schematic items CA and EB)
5.6Ω
Solenoid valve, 2 position 2 way 12V DC with
diode (schematic items FA)
8.8Ω
Solenoid valve, 2 position 3 way 12V DC with
diode
(schematic items CF, CO and CP)
8.9Ω
Solenoid valve, 2 position 4 way 12V DC with
diode (schematic items CG )
7.3Ω
Solenoid valve, 3 position 4 way 12V DC with
diode (schematic items DA and DB)
7.3Ω
Summary of Contents for GTH-1056
Page 65: ...April 2017 Service and Repair Manual Manifolds Part No 1278145 GTH 1056 55 ...
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Page 69: ...April 2017 Service and Repair Manual Manifolds Part No 1278145 GTH 1056 59 ...
Page 71: ...April 2017 Service and Repair Manual Manifolds Part No 1278145 GTH 1056 61 ...
Page 73: ...April 2017 Service and Repair Manual Manifolds Part No 1278145 GTH 1056 63 ...
Page 75: ...April 2017 Service and Repair Manual Manifolds Part No 1278145 GTH 1056 65 ...
Page 128: ...Service and Repair Manual April 2017 118 Harness Map Control System Ground Single Joystick ...
Page 129: ...April 2017 Service and Repair Manual 119 Harness Map Control System Dual Joystick ...
Page 132: ...Service and Repair Manual April 2017 122 Harness Map Deutz 3 6TCD T4F Engine ...
Page 133: ...April 2017 Service and Repair Manual 123 Harness Map Perkins 1204 T4F Engine ...
Page 135: ...April 2017 Service and Repair Manual Part No 1278145 GTH 1056 125 Harness Map Work Lights ...
Page 136: ...Service and Repair Manual April 2017 126 Harness Map Work Lights ...
Page 137: ...April 2017 Service and Repair Manual 127 Harness Map Road Lights ...
Page 138: ...Service and Repair Manual April 2017 128 GTH 1056 Part No 1278145 Harness Map Road Lights ...
Page 140: ...Service and Repair Manual April 2017 130 Harness Map Enclosed Cab with Heat ...
Page 141: ...April 2017 Service and Repair Manual 131 Harness Map Enclosed Cab with HVAC ...
Page 145: ...April 2017 Service and Repair Manual 135 Electrical Schematic ...
Page 146: ...Service and Repair Manual April 2017 136 GTH 1056 Part No 1278145 Electrical Schematic ...
Page 147: ...April 2017 Service and Repair Manual Part No 1278145 GTH 1056 137 Electrical Schematic ...
Page 148: ...Service and Repair Manual April 2017 138 Electrical Schematic ...
Page 149: ...April 2017 Service and Repair Manual 139 Hydraulic Schematic Models with Single Joystick ...
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