Basic Trouble Shooting
Motor & Solenoid for Equalizer Hydraulic Pumps
Uni-Directional Pumps 12 VDC
Equalizer Pump Numbers 2015, 2017, 1551, 1531, 2016, 2142, 1636
These uni-directional (motor only
runs one direction) units can be identified as having one motor solenoid. The
trouble shooting for these motors and solenoids are basically the same,
regardless of the application.
Troubleshooting:
Locate
the two large terminals on the motor solenoid. Using a screw driver or pliers-
short toge ther the two large terminals.
If the motor does not run, then there is one or more of the three below
possibilities
1. There not
enough power (12VDC positive) to the battery terminal on the motor solenoid to make the motor run.
Measure for voltage at the battery cable terminal on the solenoid using a
digital multi-meter. The voltage should be battery voltage (12.5 VDC). When
shorting the terminals as above, the voltage should not fall below 11.0 VDC. If
the voltage is low, check the battery conditi on and the supply cable and its
connections. Replace or repair as needed. Depending on the pump and motor
combination -up to 160 Amperes @ a minimum of 10.5 VDC may be required to run
the motor. The power and ground connections to these units should be a minimum
4 gauge cable and may need to be larger if the run is over 12 feet. Check the
owner’s manual for specific recommendations.
2. There is
a poor or no ground (12 VDC negative) to the motor. On most of these units the
motor grounds through the case to the port plate (center section of pump). The
port plate will have a grounding stud that should have a heavy wire or cable,
grounding the pump assembly back to the battery or the frame. Some motors will
have a ground stud at the end of the motor, which should have a heavy cable connected
back to the pump ground stud. If a frame ground is being used, check the
connection from the negative side of the battery to the frame.
3. The motor
is defective. You will need to check the motor chart for the proper motor for
these units.
If the
motor does run (when terminals are shorted) then there is one or more of the
below three possibilities.
1. The
solenoid is not receiving voltage to the “exciter”
terminal. This is one of the two small terminals on the motor solenoid.
Generally this terminal will have a blue wire attached to it. Using a digital
meter measure for voltage applied to it when an extend command and retract
command is given from the switch or control panel. There should be a minimum of
10.5 VDC applied to it when attempting operation.
2. The
solenoid is not grounded: The other small terminal should have a wire that goes
to the pump ground stud.
3. The
solenoid is defective. Order part # 1444 from Equalizer Systems.Note: A quick
tip that can check items 1, 2, & 3. Using a short piece of wire, apply 12
VDC positive from the battery terminal on the motor solenoid to the small
terminal (blue wire) on the motor solenoid. If the solenoid pulls in and the
motor runs -both the motor and solenoid are good. Check the control circuit for
issues.
4. The above
trouble shooting procedures will work on any Equalizer Systems Uni-directional
system- including those using SPX or Fenner units (except for those using the
Fenner Smart Start Solenoid). The stated wire colors may vary on these units.
There are many different motors used on the above units. It is required that
the numbers from the pump be provided or checked against the motor chart to
determine the proper motor. If numbers are not available, send a photo to
equalizer for identification. All of these units will use solenoid # 1444
except for SPX units with the smart start which use #7055
Bi-Directional
Pumps 12VDCEqualizer Pump Numbers 2390, 2532, 2542
These bi-directional units
control the direction of hydraulic cylinders (extend or retract) by the
direction that the motor turns (clockwise or counter-clockwise). These units
can be identified as having two motor solenoids. They are 3.7 inches in
diameter- wound field motors and have two power input studs located in the side
of the case. One of these studs is for extend the other is for retract. The
ground for the motor is through the case.
Trouble
Shooting
No Run Extend:
Locate the two large terminals on
the motor solenoid that has a blue wire attached to one of the small terminals.
This is the extend solenoid. Using a screw driver or pliers short together the
two large terminals on this solenoid. The motor should run.
No Run Retract:
Locate the two large terminals on
the motor solenoid that has a Green wire (there are some single function jack
units on trailers that this wire will be black) attached to one of the small
terminals. This is the retract solenoid. Using a screw driver or pliers, short
together the two large terminals on this solenoid. The motor should run.
If the
motor does not run then there is one ormore of the three below possibilities.
1. There
not enough power (12VDC positive) to the battery terminal(s) on the motor solenoid(s) to make the motor run.
Measure for voltage using a digital multi-meter. This power should come from
the vehicle battery. Locate the cable and its connections replace or repair as
needed. Depending on the pump and motor combination up to 160 Amperes @
a minimum of 10.5 VDC may be required to run
the motor. The power and ground feed to these units should be a minimum 4 gauge
cable.
2. There is
a poor or no Ground (12 VDC negative) to the motor. On these units the motor
grounds thru the case to the pump port plate (center section of pump). The port
plate will have a grounding stud that should have
a heavy wire or cable grounding
the pump assembly back to the battery or the frame. If a frame ground is being
used check the connection from the negative side of the battery to the frame.
3. The motor
is defective. Order motor # 2605.
If the
motor does run (when terminals are shorted) then there is one or more of the
below three possibilities.
1.The
solenoid(s) is not receiving voltage to the “exciter”
terminal(s). This is one of the two small terminals on the motor solenoid.
Generally the extend terminal will have a blue wire attached to it and the
retract terminal will have a green wire to it. Using a digital multi-meter,
measure for voltage applied to the blue or green when an extend command or
retract command is given from the switch or control panel. There should be a
minimum of 10.5 VDC applied to the blue or green wires when attempting
operation.
2. The
solenoid is not grounded: The other small terminal on the solenoid(s) should
have a wire that goes to the pump ground stud.
3. The
Solenoid is Defective. Order part # 1444 from Equalizer Systems.
Note: A quick tip that can check
items 1, 2, & 3.Using a short piece of wire, apply 12 VDC positive from the
battery terminal on the motor solenoid to the small terminal (blue wire for
extend, green wire for retract) on the motor solenoid(s). If the solenoid pulls
in and the motor runs- both the motor and solenoid are good. Check the control
switch or control circuit for the issue. This is done by measuring for voltage
at the blue wire for extend, or the green wire for retract when trying to
operate from the control switch. The measured voltage should be a minimum of
10.5 VDC. If there is no voltage or low voltage, check the control circuit.
On
bi-directional pumps, the motor could be good in one direction but not the
other. It is best to test it both ways. Pump 2390, 2532, & 2542: Motor part
#2605 Solenoid part #1444 (of which there are two)
Bi-Directional
Pumps 12VDC Equalizer Pump Numbers 2727, 2754 Using 70 amp Cole Hearse Relays
(These were used only on trailer jacks)
Bi-directional pump units control
the direction of hydraulic cylinder(s) (extend or retract) by the direction
that the motor turns (clockwise or counterclockwise). These motors are polarity
reversing with permanent magnet fields. The motor direction is controlled by
switching polarity to the two terminals at the end of the motor. Donot attempt
to “jump” or short the relays on these units for testing- As a dead short to
ground could occur and damage the relays and the wiring. The use of a volt
meter is required for testing. Power and ground may be applied directly to the
motor terminals for testing only if the leads from the relays (2) are
disconnected from the motor terminals. One of the relays is energized for
extend- the other one is for retract.
Trouble
Shooting
No Motor Run in Either Direction
(Extend or Retract):
Using a digital multi-meter,
measure for voltage across the two motor terminals at the end of the motor when
pressing the switch to extend and retract. There should be at least 10.5 VDC
measured. If voltage is good then the motor is defective. If voltage is low
then there is a power supply issue- such as; a week battery, poor connections
from the battery to the relays, or poor connections from the relays to the
motor.
If there is no voltage then the
battery is dead- or the wiring connections from the battery to the relays is
defective- or the relays are defective- or the control switch(s), harness is
defective.
Motor Runs in Only One Direction
(Extend or Retract):
This will be a defective relay-
or poor connections to one of the relays- or an issue with the switch and
harness assembly. Use a volt meter and measure for voltage at the exciter
terminal on each of the relays to determine if the issue is a relay- or the
switch or harness. One of the relays will have a small green wire feeding it.
This is the retract relay. The green wire should have voltage applied to it
when pressing the switch to retract the jack. If there is voltage present and
the relay will not ‘click’ on, then the relay is most likely defective. If the
jack won’t extend, perform the same test for other the other relay. The extend
relay exciter wire is probably white with a black trace. If there is no voltage
on one or both of the exciter wires when trying to operate it, then the plug
connector or the switch and harness may have an issue.
Power
Supply for This Unit:
1.
The positive wire is a heavy red wire- Minimum 10
gauge
2.
The negative is a heavy black wire- Minimum 10
gauge
3.
The power should come from the vehicle battery
4.
If the run is longer than 6 feet, larger gauge
wiring should be used
5.
If power is run thru a circuit breaker or fuse -it
must be a minimum 60 Amperes
6. Depending
on the pump and motor combination up to 60 Amperes @ a minimum of 10.5
7. VDC may
be required to run the motor
Pump 2727 & 2754: Motor part
#2751 Relay part #2735 (of which there are two)
Bi-Directional
Pumps 12VDC Equalizer Pump Numbers 2727, 2754, 3040, 3041, 3043 Using Reversing
Contactor
These bi-directional units control
the direction of hydraulic cylinder(s) (extend or retract) by the direction
that the motor turns (clockwise or counterclockwise). These motors are polarity
reversing with permanent magnet fields. The motor direction is controlled by
switching polarity to the two terminals at the end of the motor. Donot attempt
to “jump” or short the relays on these units for testing- As a dead short to
ground could occur and damage the relays and the wiring. The use of a volt
meter is required for testing. Power and ground may be applied directly to the
motor terminals for testing only if the leads from the contactor are
disconnected from the motor terminals.
Trouble
Shooting
No Motor Run in Either Direction
(Extend or Retract):
Using a digital volt meter
measure for voltage across the two motor terminals at the end of the motor when
pressing the switch to extend and retract. There should be at least 10.5 VDC
measured. If voltage is good then the motor is defective. If voltage is low
then there is a power supply issue suchas a week battery or poor connections
from the battery to the contactor or from the contactor to the motor. If there
is no voltage measure for voltage across the plus terminal and the negative
terminal on the contactor. Voltage should be 12.5 VDC (battery voltage) if
there is no voltage or low voltage then the battery is dead or the wiring
connections from the battery to the contactor are defective.
If there is good voltage at the
terminals (positive and negative) then the contactor is defective or the
contactor is not receiving exciter voltage to the green wire (retract) or the
blue wire (extend) or the exciter ground (black center spade terminal) is
defective. The Motor Only Runs One Direction:Check for voltage at the green
exciter wire on the contactor when pressing a retract switch. Check for voltage
at the blue exciter wire on the
contactor when pressing a extend
switch. If there is voltage (at least 10.5 VDC) and the contactor won’t “click”
in and make the motor run, then the contactor is defective. If there is no
voltage to the blue wire when pressing an extend switch orno voltage to the
green wire when pressing a retract switch, there is an issue with the control
circuit.
Pump
2727, 2754, 3040, 3041, & 3043: Motor part #2751 Contactor part #2994
General
Items for All Types of Pumps
1.
There not enough power
(12VDC positive) to the battery terminal(s) on the motor solenoid(s) to make
the motor run. Measure for voltage using a digital multi-meter. This power
should come from the vehicle battery. Locate the cable and its connections
replace or repair as needed. Depending on the pump and motor combination up to
160 Amperes @ a minimum of 10.5 VDC may be required to run the motor.
2. There is a poor or no ground (12 VDC negative) to the motor. On most of
these units the motor grounds through the case to the pump port plate (center
section). The port plate will have a grounding stud that should have a heavy
wire or cable grounding the pump assembly back to the battery or the frame.
Some of these units are reversing polarity and the ground is done through one
of the motor terminals. If a frame ground is being used to ground the pump (or
the contactor or relays), check the connection from the negative side of the
battery to the frame.
3. Exciter voltage: all of these units employ a solenoid or contactor or
relays that switch (turn on) power to the motor.If these solenoid(s) or
contactor or relays are not receiving exciter voltage from the control circuit,
the motor will not run until this is corrected. For Auto-Level systems see
trouble shooting guide for Auto-Level.
