Service Manual

Topdresser 1800 & 2500 Page 4 – 7 Electrical System

Solenoid Valve Coil

The hydraulic system on the Topdresser 2500 uses a

solenoid valve coil on the hydraulic control manifold at

port S1 (Fig. 8 and 9). The coil is energized when the

control handle switch is in the ON position.

NOTE: If the Topdresser 2500 is equipped with the op-

tional brake kit, a second solenoid valve coil will be in-

cluded on the hydraulic control manifold at port S2.

Testing

NOTE: The solenoid does not have to be removed from

the cartridge valve for testing.

1. Make sure the Topdresser trailer wire harness is un-

plugged from battery harness.

2. Unplug solenoid valve coil electrical connector from

wire harness connector.

NOTE: Prior to taking small resistance readings with a

digital multimeter, short the test leads together. The me-

ter will display a small resistance value (usually 0.5

ohms or less). This resistance is due to the internal re-

sistance of the meter and test leads. Subtract this value

from from the measured value of the component you are

testing.

3. Measure resistance between the two coil connector

terminals. Resistance of the solenoid coil should be

approximately 10.4 ohms.

4. If solenoid coil needs replacement, see Solenoid

Valve Coil in the Service and Repairs section of this

chapter.

5. Reconnect harness electrical connector to the sole-

noid valve coil.

6. Connect trailer wire harness to battery harness.

1. Hydraulic manifold 2. Solenoid coil (S1)

Figure 8

HYDRAULIC MANIFOLD FROM MACHINE

WITH SERIAL NUMBER BELOW 240000000

FRONT

1. Hydraulic manifold 2. Solenoid coil (S1)

Figure 9

HYDRAULIC MANIFOLD FROM MACHINE

WITH SERIAL NUMBER ABOVE 240000000

FRONT

Electrical

System