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September 2016
3-7
How to Check the Resistance
of a Valve Coil
1 Fully lower the platform, turn the machine off
and remove the key.
2 Connect the leads from an ohmmeter to the
valve coil terminals.
Valve coil specifications
Solenoid operated N.O. valve, 10V
Lowering valve, 10V
(located at base of cylinder)
Part No. 40462
5.9 to 7.2 Ω
7.8 to 9.5 Ω
DPL-25S • DPL-30S • DPL-35S Super Series
Section 7 - Repair Procedures
HYDRAULIC POWER UNITS
3-8
How to Test the Motor Start
Solenoid - DC Models
Electrocution/burn hazard. Contact
with electrically charged circuits
may result in death or serious
injury. Remove all rings, watches
and other jewelry.
Electrocution/burn hazard.
Disconnect the ground cable from
the battery before performing this
procedure.
1 Label and disconnect all the wiring from the
motor start solenoid.
2 Connect the leads from an ohmmeter to each
terminal combination and check for continuity.
Test
Small post to ground
2 large posts
Small post to
any large post
b
a
a
high amp power contact terminal
(large post)
b
solenoid activate coil terminal
(small post)
3 Connect 12V DC to the small post and a ground
wire to the case of the solenoid, then test the
following terminal combinations.
Test
2 large posts
Desired result
13 to 17 Ω
no continuity
(infinite Ω)
no continuity
(infinite Ω)
a
Desired result
continuity (zero Ω)
7 - 13
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