Electrical Checkout
These instructions are for a standard valve with 60
Ohm coil. Valves with other coils should be checked to
±10% of the rated resistance of the coil.
1. Using a standard ohmmeter, check the servovalve
lead resistance.
2. Check the coil resistance as follows:
a. Attach ohmmeter leads to pin A and pin B. Coil
resistance should read between 54 ohms and 66
ohms.
b. There shall be no continuity between either pin and
servovalve case.
c. If coil resistance is greater than 66 ohms or less
than 54 ohms, return the servovalve to the factory.
Back Pressure
During normal hydraulic system operation, back
pressure in the return system (tank line) is approxi-
mately 25 psi. Excessive back pressures due to
clogged filters, system contamination, system out of
trim etc., impose undesired forces on system compo-
nents, and add significantly to the work required to
move a load. Energy is being wasted and system
components are being overworked. Back pressures in
excess of 200 psi should be investigated immediately
and the discrepancies corrected.
Field Service Suggestions
Initial Checkout Procedure
1. Remove the electrical cable from the valve and
connect pins A & B to a hand held power source. (A
1.5 to 9 volt battery with a potentiometer to vary the
input will do.)
2. Operate the valve with the hand held power source.
If the indicated problem cannot be duplicated, the
malfunction is more than likely in the wiring, controller
or hydraulic system.
3. If the system still exhibits the problem, refer to Table
2 for service suggestions.
Service Information
Series BD15 and BD30
Kit Number*
Pressure Range (PSI)
Color Code
810014-00**
Ext. Pilot 0 to 3000
Red
810014-16
2600 - 3000
Green
810014-18
2000 - 2550
Blue
810014-20
1400 - 1950
Yellow
810014-22
1000 - 1350
Orange
810014-33
700 - 950
Black
810014-50
200 - 650
White
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