Meyer E-68 E-Z Mount Xpress User manual

FORM NO. 1-822 R1
May 2011
E-68 Xpress
power unit
service manual
© 2011 Printed in the U.S.A.
Meyer Products LLC
18513 Euclid Ave. • Cleveland, Ohio 44112-1084
Phone [phone] (Area Code 216)
www.meyerproducts.com• email [email protected]

FOREWARD
This Service Manual includes complete information for servicing the following Electro Lift®Units:
E-68 E-Z Mount Xpress
IMPORTANT: Maintenance and repairs must be performed with the moldboard on the
ground.
The information is grouped according to the type of work being performed, such as diagnosis and
testing, disassembly and reassembly. Special tools and specifications are also included in this manual.
All information, illustrations and product descriptions contained in this manual are correct at publication
time. We do, however, reserve the right to make changes at any time without prior notice.
MEYER PRODUCTS INC.
SECTION INDEX
Section Number Section Title ..................................................... Page
0 GENERAL INFORMATION AND
MAINTENANCE ........................................................ 1
1 GENERAL DESCRIPTION AND
THEORY OF OPERATION ........................................ 5
2 DIAGNOSIS ............................................................. 16
3 REPAIR PROCEDURE .............................................. 24
4 SPECIFICATIONS ..................................................... 43
Meyer Products Inc. reserves the right, under its continuing product improvement program, to change construction or
design details, specifications and prices without notice or without incurring any obligation.

SECTION 0 - GENERAL INFORMATION AND MAINTENANCE
CONTENTS
GENERAL INFORMATION .................................................. 2
•M
ODEL IDENTIFICATION .................................................... 2
•M
ODEL IDENTIFICATION AND
SERIAL NUMBER LOCATION .............................................. 2
•M
OTOR IDENTIFICATION ................................................... 2
MAINTENANCE ................................................................... 2
•G
ENERAL MAINTENANCE ................................................... 2
•C
LEANLINESS ................................................................. 2
•V
EHICLE ELECTRICAL SYSTEM ........................................... 2
•C
HECK REGULARLY ........................................................ 2
POST-SEASON MAINTENANCE ........................................... 2
•M
EYER HYDRAULIC FLUID M-1 ......................................... 2
•R
EPLACEMENT OF HYDRAULIC FLUID ................................... 3
•F
ILTERS ........................................................................ 3
•P
ROTECTION AGAINST RUST
AND CORROSION ............................................................ 3
-1-

Vehicle Electrical System
Maximum performance and efficiency of the Electro
Lift®unit requires that the vehicle’s electrical system
be properly maintained and consist of:
Battery ----------- 70 Amp. Hr. Minimum or
550 Cold Cranking Amps.
Alternator ------ 60 Amp. Minimum
Check Regularly
1. Battery Terminals - Must be clean and free of
corrosion.
2. Electrical Connections - Must be free of corrosion
and tight.
3. Battery - Must be in first-class condition.
4. Alternator (or Generator) and Regulator - Must be
functioning to specifications.
5. Hydraulic Fluid Reservoir Level - A significant drop
in hydraulic fluid level indicates a leak which must
be located and corrected. Insufficient hydraulic fluid
may result in severe damage.
POST-SEASON MAINTENANCE
Meyer Hydraulic Fluid M-1.
Meyer Hydraulic Fluid M-1 is a specially formulated
mineral oil which maintains an almost constant
viscosity from normal to sub-zero temperatures.
Because it remains free flowing at extremely low
temperatures, the performance and efficiency are not
affected.
Meyer Hydraulic Fluid M-1 also contains an additive
which neutralizes moisture accumulating in the fluid
due to condensation. It is effective for a maximum of
one year’s use.
Meyer Products Inc. will not be liable for damages
resulting from the use of inferior or other fluids or
oils.
GENERAL INFORMATION
Model Identification
The E-68 unit is an electrically powered hydraulic
mechanism specifically designed for use with the Meyer
E-Z Mount Xpress Snow Plow systems.
Model Identification and Serial Number Location
Inclusion of the model number and serial number is
extremely important when writing up warranty claim
forms and product report forms for proper evaluation
and follow up.
The basic model number is located on the name
plate (plastic cover). The serial number is located
on the name plate decal underneath the plastic cover.
MAINTENANCE
The following maintenance information is intended as
a basic guide for providing the E-68 unit with the proper
service and care. Sustained heavy duty operation or
operating under adverse conditions may necessitate
more frequent servicing.
General Maintenance
Cleanliness
The greatest enemy to any hydraulic system is dirt or
contamination. Therefore, cleanliness must be stressed
at the time of installation, servicing and repairing.
-2-

Replacement of Hydraulic Fluid
After a season’s use, completely drain the hydraulic
fluid (including hydraulic fluid in hoses and
cylinders). Drain fluid through filler hole shown in
Figure 0-1 or drain hole in base by completely
retracting lift rod and unbolting unit to pour fluid
out or using a suction pump. Disconnect the fittings
at the Angling and Mount (E-68 only) cylinders and
completely retract the cylinder rods and purge
cylinders and hoses of all hydraulic fluid. Flush the
complete system including unit, hoses and angling
rams with the M-2 Flushing Fluid, or a non wax
(Napthenic) cleaner. If kerosene (Parrafinic) is used
to flush the system, the system must be flushed
again to remove any kerosene with M-2 Flushing
Fluid, or a (Napthenic) based cleaner that is wax
free .
Refill E-68 unit with M-1 Fluid by fully retracting lift rod
(Ram) and filling reservoir to 1-1/2 “ below the filler
hole. Fill and bleed hoses and Power Angling and
Mount cylinders by loosening hydraulic fittings at
cylinders until they leak. Power angle plow repeatedly
from one side to the other until fluid flows steadily from
the leaking fittings while maintaining a constant check
on the reservoir fluid level. Repeat for mounting
cylinder.
Raise and lower the plow several times and with lift
rod fully retracted, give a final check to the fluid
level and replace filler plug.
Filters
Clean the two filters located in base of unit and
power angling block with mineral spirits or
equivalent and blow out with compressed air. See
Figure 0-1 for filter locations.
Protection Against Rust and Corrosion
When the E-68 unit is not used for extended periods,
protect the chromed lift rod (Ram) by fully extending
it and coating it with chassis lubricant. Full extension
of the lift rod (Ram) fills the cylinder with hydraulic
fluid. Coat the exposed portions of the Power Angling
cylinder rods (Rams) and Mount cylinder of the E-Z
Mount Xpress with chassis lubricant to protect them
against rust and corrosion.
-3-
Drain Plug
Filler Plug
Filter Plugs
Lift Rod
FIGURE 0-1 E-68

SECTION 1 - GENERAL DESCRIPTION AND THEORY OF OPERATION
CONTENTS
GENERAL DESCRIPTION ................................................................................................. 5
THEORY OF OPERATION ................................................................................................. 5
•F
UNCTIONS E-68 ......................................................................................................... 5
•E
LECTRICAL AND FLOW CHARTS ...................................................................................... 6-11
ELECTRO LIFT® UNIT COMPONENTS ......................................................................... 12
•M
OTORS ...................................................................................................................... 12
•• Iskra .................................................................................................................... 12
•H
YDRAULIC PUMP .......................................................................................................... 12
•P
RESSURE RELIEF VALVE ................................................................................................ 12
•S
OLENOID VALVES ......................................................................................................... 12-13
•• Cartridge ............................................................................................................ 12
•• Coil...................................................................................................................... 13
“A” Solenoid Valve............................................................................................. 13
“B” Solenoid Valve ............................................................................................ 13
“C” Solenoid Valve ........................................................................................... 13
“D” Solenoid Valve ........................................................................................... 13
“E” Solenoid Valve ............................................................................................ 13
•C
HECK VALVES .............................................................................................................. 13
•P
ILOT CHECK VALVE ...................................................................................................... 14
•C
ROSSOVER RELIEF VALVES ............................................................................................ 14
•S
OLENOID SWITCH ........................................................................................................ 14
•F
ILTERS ....................................................................................................................... 14
-4-

GENERAL DESCRIPTION
E-68 unit is an electrically powered and electrically
controlled hydraulic mechanism specifically designed
for use with Meyer Snow Plows. The E-68 raises and
lowers the plow with an integral 8" stroke hydraulic
cylinder. The E-68 will also mount and dismount the
Xpress plow system from the vehicle using a hydraulic
Mount/Dismount Cylinder.
In addition to raising and lowering the plow
hydraulically, the E-68 angles the plow hydraulically,
left and right, via remote hydraulic cylinders.
The Electro Lift®unit consists of a specially designed
high torque 12-volt DC motor which is directly coupled
to a gear-type hydraulic pump. The pump obtains its
supply of hydraulic fluid from an integral reservoir which
totally surrounds the integral hydraulic cylinder which
raises and lowers the plow.
The E-68 includes an integral valve body which contains
five electrically controlled solenoid valve cartridges.
Solenoid valve cartridge “A” which is energized to allow
the plow to lower by gravity. Solenoid valve cartridge
“B” is energized to route the pressurized hydraulic fluid
to the integral hydraulic cylinder to raise the plow.
Solenoid valve cartridge “C” is energized to route the
pressurized hydraulic fluid to the left remote hydraulic
cylinder to angle the plow to the right. Solenoid valve
cartridge “D” is energized to route the pressurized
hydraulic fluid to the right remote hydraulic cylinder
to angle the plow to the left. Solenoid valve cartridge
“E” is energized to route the pressurized hydraulic
fluid to extend the mount/dismount hydraulic
cylinder to remove the plow from the vehicle.
Mounting the plow to the vehicle only requires
energizing the electric motor since the normal route
for the pressurized hydraulic fluid is to retract the
mount hydraulic cylinder.
Additional components which control and supply
electrical current to the E-68 units are an operator
controlled Pistol Grip; a solenoid switch to supply high
amperage current to the unit’s motor (motor solenoid);
valve cartridge(s); and short heavy gauge cables to
distribute high amperage current directly from the
positive terminal of the vehicle’s battery and ground
the unit directly to the negative terminal of the vehicle’s
battery.
THEORY OF OPERATION
FUNCTIONS
The E-68’s six basic functions performed are:
• Raise snow plow
• Lower snow plow
• Angle snow plow to right
• Angle snow plow to left
• Mount Xpress Snow Plow System
• Dis-mount Xpress Snow Plow System
Refer to Figures 1-1 through 1-6 (pages 6 thru 11)
for electrical and hydraulic flow chart for each
function. Each figure explains which component is
actuated and related in each function.
-5-

PUMP CHECK VALVE
STRAINER
LIFT CYLINDER
SUMP CASTING
FILTER PRESSURE PORT
RESERVOIR
RESERVOIR
RETURN TO RESERVOIR
"B" CHECK VALVE
LOWER ADJUSTMENT
DUAL PILOT CHECK
MOUNT - DISMOUNT CYLINDER
A
E
VALVE ASSEMBLY
FILTER
X
PUMP
B
MOUNT
NOT "ENERGIZED"
PRESSURE RELIEF VALVE NON ADJUSTABLE OPENS at 2000 + 50 P.S.I.
CROSS-OVER RELIEF VALVE 3800 + 400 P.S.I.
POWERANGLING CYLINDERS
DUAL PILOT CHECK
POWERANGLING CYLINDERS
RETURN TO RESERVOIR
D
X
C
X
E-68 Mount, Motor Only
-6-
FIGURE 1-1

PUMP CHECK VALVE
STRAINER
LIFT CYLINDER
SUMP CASTING
FILTER PRESSURE PORT
RESERVOIR
RESERVOIR
RETURN TO RESERVOIR
"B" CHECK VALVE
LOWER ADJUSTMENT
DUAL PILOT CHECK
MOUNT - DISMOUNT CYLINDER
A
VALVE ASSEMBLY
FILTER
X
PUMP
B
DISMOUNT
E
PRESSURE RELIEF VALVE NON ADJUSTABLE OPENS at 2000 + 50 P.S.I.
CROSS-OVER RELIEF VALVE 3800 + 400 P.S.I.
POWERANGLING CYLINDERS
DUAL PILOT CHECK
POWERANGLING CYLINDERS
RETURN TO RESERVOIR
C
X
D
X
PURPLE WIRE "ENERGIZED"
PURPLE "ENERGIZED" (TAN WIRE GROUND)
E-68 Dismount, Motor and “E” Solenoid
-7-
FIGURE 1-2

PUMP CHECK VALVE
STRAINER
LIFT CYLINDER
SUMP CASTING
PRESSURE RELIEF VALVE- NONADJUSTABLE 2000 P.S.I.
CROSS-OVER RELIEF VALVE 3800 + 400 P.S.I.
POWERANGLING CYLINDERS
FILTER PRESSURE PORT
DUAL PILOT CHECK
POWERANGLING CYLINDERS
RESERVOIR
RESERVOIR
RETURN TO RESERVOIR
RETURN TO RESERVOIR
"B" CHECK VALVE
LOWER ADJUSTMENT
DUAL PILOT CHECK
MOUNT - DISMOUNT CYLINDER
A
E
VALVE ASSEMBLY
FILTER
PUMP
B
RAISE
NOT "ENERGIZED"
X
D
X
C
X
RED WIRE "ENERGIZED"
RED "ENERGIZED" (TAN WIRE GROUND)
E-68 Raise, Motor and “B” Solenoid
-8-
FIGURE 1-3

E-68 Lower, “A” Solenoid
PUMP CHECK VALVE
STRAINER
LIFT CYLINDER
SUMP CASTING
PRESSURE RELIEF VALVE- NONADJUSTABLE 2000 P.S.I.
FILTER PRESSURE PORT
RESERVOIR
RESERVOIR
RETURN TO RESERVOIR
"B" CHECK VALVE
LOWER ADJUSTMENT
DUAL PILOT CHECK
MOUNT - DISMOUNT CYLINDER
A
C
E
D
VALVE ASSEMBLY
FILTER
PUMP
B
LOWER/FLOAT
CROSS-OVER RELIEF VALVE 3800 + 400 P.S.I.
POWERANGLING CYLINDERS
DUAL PILOT CHECK
POWERANGLING CYLINDERS
RETURN TO RESERVOIR
BLACK WIRE "ENERGIZED"
BLACK "ENERGIZED" (TAN WIRE GROUND)
-9-
FIGURE 1-4

E-68 Angle Left, Motor and “D” Solenoid
PUMP CHECK VALVE
STRAINER
LIFT CYLINDER
SUMP CASTING
FILTER PRESSURE PORT
RESERVOIR
RESERVOIR
RETURN TO RESERVOIR
"B" CHECK VALVE
LOWER ADJUSTMENT
DUAL PILOT CHECK
MOUNT - DISMOUNT CYLINDER
A
E
VALVE ASSEMBLY
FILTER
PUMP
LEFT ANGLE
NOT "ENERGIZED"
PRESSURE RELIEF VALVE NON ADJUSTABLE OPENS at 2000 + 50 P.S.I.
CROSS-OVER RELIEF VALVE 3800 + 400 P.S.I.
POWERANGLING CYLINDERS
DUAL PILOT CHECK
POWERANGLING CYLINDERS
RETURN TO RESERVOIR
B
X
C
X
D
X
YELLOW WIRE "ENERGIZED"
YELLOW "ENERGIZED" (TAN WIRE GROUND)
-10-
FIGURE 1-5

E-68 Angle Right, Motor and “C” Solenoid
PUMP CHECK VALVE
STRAINER
LIFT CYLINDER
SUMP CASTING
FILTER PRESSURE PORT
RESERVOIR
RESERVOIR
RETURN TO RESERVOIR
"B" CHECK VALVE
LOWER ADJUSTMENT
DUAL PILOT CHECK
MOUNT - DISMOUNT CYLINDER
A
C
E
D
VALVE ASSEMBLY
FILTER
X
X
PUMP
B
RIGHT ANGLE
NOT "ENERGIZED"
PRESSURE RELIEF VALVE NON ADJUSTABLE OPENS at 2000 + 50 P.S.I.
X
X
CROSS-OVER RELIEF VALVE 3800 + 400 P.S.I.
POWERANGLING CYLINDERS
DUAL PILOT CHECK
POWERANGLING CYLINDERS
RETURN TO RESERVOIR
GREEN WIRE "ENERGIZED"
GREEN "ENERGIZED" (TAN WIRE GROUND)
-11-
FIGURE 1-6

Under a condition, such as when a hydraulic
cylinder is extended to the end of its stroke,
eliminating additional space for the pressurized
hydraulic oil to be pumped into, the alternate
opening and closing of the poppet valve controls
the pump’s pressure output and provides an escape
for the pressurized hydraulic fluid.
The pressure relief valve used in the E-68 pump, while
more sophisticated than the one described, functions
in the same manner. The pump pressure relief valve
may be adjusted to the specified pressure of 2000 P.S.I.
by adjusting the set screw after installing a suitable
pressure gauge of 2500 P.S.I. in the circuit.
SOLENOID VALVES
Hydraulic valves are simple in concept and all have
the same basic function: Control the direction of oil
flow.
Each Solenoid Valve consists of two components:
the Cartridge and the Coil.
Cartridge
The Cartridge consists of the hydraulic valve
mechanism and an armature which enables the
valve mechanism to be operated and controlled
electrically. The Cartridge is designed to screw in
and out of the E-68 units much like the typical
“spark plug”.
Coil
FIGURE 1-13
COIL
VALVE SPOOL
WINDING
ARMATURE
FIGURE 1-11
ELECTRO LIFT® UNIT COMPONENTS
RESERVOIR
ELECTRIC
MOTOR
FLOW
OUTLET LINE
INTAKE LINE
PUMP CHAMBER
PUMP HOUSING
DRIVE GEAR
DRIVEN GEAR
FLOW
OUTLET PORT
POPPET
VALVE
VALVE
SPRING
PUMP HOUSING
INLET PORT
FIGURE 1-12
-12-
PRESSURE RELIEF VALVE
A basic pressure relief valve is shown in
Figure 1-12. It consists of a poppet valve and a
valve spring. Both are located in a passage
which connects the inlet passage to the outlet
passage. The poppet valve is normally held closed
by the valve spring, sealing the connecting passage
from the pressurized outlet passage. The poppet
valve, being a piston, is exposed to the pressurized
hydraulic fluid in the outlet passage. Whenever the
hydraulic pressure against the poppet valve
becomes greater than the pressure being exerted
on the poppet valve from the opposite direction by
the valve spring, the poppet valve will open. This allows
some of the pressurized hydraulic fluid to flow through
the connecting passage to the non pressurized inlet
passage. The effect is to lower the pressure in the outlet
passage which will allow the valve spring to close the
poppet valve again.
E-68 UNIT COMPONENTS
MOTOR (4-1/2”)
Iskra - Two terminal
The Iskra motor is a four pole, electromagnet motor
which consists primarily of a 4-1/2" diameter solid steel
frame, armature, brushes, field coils and pole pieces.
This motor can be used on vehicles with either the
common negative ground electrical system or the
positive ground electrical system.
HYDRAULIC PUMP
The pump in a hydraulic system employs an external
source of power to apply a force to a liquid. A pump
develops no power of its own. It simply transfers power
from an external source (the electric motor on the E-
68 unit) to the liquid in the hydraulic system.
The basic operating principles of the hydraulic pump
used in the E-68 units are quite simple. Figure 1-11
illustrates the basic components of a positive
displacement gear type pump and their functions. The
pumping action takes place within the pump chamber
which is connected to the reservoir by the intake line.
The pump chamber has an outlet line in which the liquid
under motion and pressure leaves the pump to perform
work.

“C” Solenoid Valve E-68 only
The “C” Cartridge contains a spool valve when in the
energized position, the pressurized hydraulic fluid is
diverted to the left power angling cylinder, angling the
plow to the right. Also, the hydraulic fluid being forced
from the retracting right power angling cylinder flows
through the “D” Cartridge when de-energized back to
the reservoir.
“D” Solenoid Valve E-68 only
The “D” Cartridge contains a spool valve when in
the energized position, the pressurized hydraulic
fluid is diverted to the left power angling cylinder,
angling the plow to the right. Also, the hydraulic
fluid being forced from the retracting right power
angling cylinder flows through the “C” Cartridge
when de-energized back to the reservoir.
“E” Solenoid Valve E-68 Only
The “E” Solenoid valve is used on the E-88 E-Z
Mount Xpress for mounting and dismounting of the
plow from the vehicle. The “E” Cartridge contains a
spool valve whose static (de-energized) position
allows the pressurized hydraulic fluid to flow to the
live end of the mount cylinder which mounts the
plow to the vehicle. At the same time, it allows the
hydraulic fluid being forced from the dead end of
the double acting mount/dismount cylinder to flow
through the “E” Cartridge back to the reservoir.
In the energized position, the pressurized hydraulic
fluid is diverted to the to the dead end of the mount
cylinder which dismounts the plow from the vehicle.
At the same time, it allows the hydraulic fluid being
forced from the live end of the double acting mount/
dismount cylinder to flow through the “E” Cartridge
back to the reservoir.
CHECK VALVES
Check valves are very simple devices that have two
basic functions: They prevent fluid from passing through
them in one direction, but they allow fluid to pass
through them in the opposite direction.
In the E-68 a pump check valve is used to prevent
hydraulic fluid from leaking back through the pump to
the reservoir.
The E-68 unit uses one check valve located between
the “B” Solenoid Valve and the lift cylinder. It prevents
the hydraulic fluid in the lift cylinder from leaking back
through the “B” Solenoid Valve which could cause the
plow to drift down.
-13-
ELECTRO LIFT® UNIT COMPONENTS CONT.
The Coil is the electrical component which operates
the Cartridge’s valve mechanism by producing
magnetism which pulls the Cartridge’s armature
toward it. Since the armature is connected to the
valve mechanism’s only moving part, it is pulled
by the armature.
Figure 1-13 illustrates the typical Coil. Whenever
electrical current flows to the Coil, it flows
through the winding, which consists of
numerous turns of copper wire. The flow of
current through the winding produces a
magnetic field which pulls the soft iron armature
further into the Coil.
The armature pulls the valve spool or poppet
valve into its alternate (energized) position. Not
illustrated is an integral coil spring, which is
compressed when the armature is pulled by the
magnetism.
When the current flow ceases, the magnetic field
disappears and the compressed coil spring
pushes the armature back to its original
(de-energized) position.
“A” Solenoid Valve E-68
The “A” Cartridge contains a poppet valve whose static
or de-energized position is closed. Its energized
position is open.
The “A” Solenoid Valve retains hydraulic fluid in the
lift cylinder. It is energized (opened) to allow the
hydraulic fluid to flow from the lift cylinder back to
the reservoir, enabling the plow to lower by gravity.
The “A” Solenoid Valve is designed to remain
energized (open) while the plow is lowered, plowing
snow. This is the “float” feature which insures that
the plow maintains contact with the ground contour.
“B” Solenoid Valve E-68
The “B” Cartridge contains a poppet valve whose
static or de-energized position is closed. Its energized
position is open.
The “B” Cartridge contains a spool valve whose
(energized) position allows the pressurized hydraulic
fluid to flow to the lift cylinder, raising the plow.
The “B” Cartridge de-energized position retains the
hydraulic fluid in the lift cylinder, holding the plow
up.

SOLENOID SWITCH
The E-68 motor requires more current or amperage to
operate than the vehicle wiring, vehicle ignition switch
or toggle switches have the capacity to handle. The
solenoid switch is essentially a heavy duty switch with
the capacity to handle the heavy current required by
the motor. It is closed electrically by the solenoid to
convey the heavy current directly from the vehicle
battery via heavy gauge electrical cable. The solenoid,
which functions essentially the same as the previously
described solenoid valves, receives its low amperage
current at the proper times via the wiring harness. This
solenoid must be grounded to operate properly.
FILTERS
Cleanliness is perhaps the single most important
ingredient in assuring a hydraulic system’s reliability.
Should the hydraulic fluid become contaminated,
malfunction and permanent damage to the
hydraulic system may occur. For this reason, all
the E-68 units are equipped with a filter system
consisting of:
• A fine screen strainer on the reservoir pump inlet.
•A high pressure filter on the pressure side of the pump.
•A return filter on the power angling block leading
back to the reservoir..
With this system, the hydraulic fluid is filtered as it
leaves the reservoir on its way to the pump and on
the Power Angling units filtered again as it leaves
the pump. Because clean hydraulic fluid is most
important to insure Solenoid Valve reliability, the
hydraulic fluid leaving all cylinders is filtered before
passing returning to the reservoir. The filter screen,
high pressure and return filter are easily removed
for periodic cleaning or replacement.
IMPORTANT:
Should the hydraulic fluid become contaminated,
it will be necessary to replace all the hydraulic oil in
the system. The complete system (hydraulic unit,
power angling cylinders, mount cylinder and hoses)
should be flushed. Flush the system with Meyer
Hydra-Flush™ Fluid M-2.
ELECTRO LIFT® UNIT COMPONENTS CONT.
DOUBLE ACTING PILOT CHECK VALVE
The pilot check valve is more sophisticated in that it
incorporates a piston in addition to the ball, seat and
spring. It is located between the “C” and “D” Solenoid
Valves on the E-68. It has two functions: The first is to
prevent the hydraulic fluid in either power angling
cylinder from leaking back to the reservoir. The second
is to allow the hydraulic fluid from the retracting power
angling cylinder during the angling cycle to return to
the reservoir. This is accomplished by the pressurized
hydraulic fluid moving the piston which forces the check
ball off its seat. The E-68 also uses an additional pilot
check valve located next to the “E” valve. This allows
the “E” valve to control the mount/dismount function.
CROSSOVER RELIEF VALVE
When plowing snow, a snow plow can be exposed to
damaging forces caused by impact with hidden
obstructions, ends of curbs, etc. With power angling,
these damaging forces can damage not only the
snow plow but also the vehicle. The crossover relief
valve has the function of protecting the snow plow
system against these damaging forces under normal
snow plowing conditions. The crossover relief valve,
cannot protect the system from damaging forces
that are too great due to abusive snow plowing
conditions.
Basically, the crossover relief valve functions exactly
like the previously described pump relief valve. It’s
designed to open at a specific pressure.
In this instance, the pressure is not produced by
the pump but rather by the damaging force. As an
example, assume that the right corner of the plow
runs into the end of a curb. The impact will attempt
to collapse the right power angling cylinder. As a
result, very high hydraulic pressure is produced
within the cylinder. When the produced pressure is
high enough, it opens the crossover relief valve,
allowing the highly pressurized hydraulic fluid to flow
directly to the left power angling cylinder.
When the crossover relief valve functions in this manner,
the excessive pressure is released, the excessive energy
produced by the impact is absorbed, and the result is
only a change in angled position of the plow.
The crossover relief valve is factory set to the specified
pressure of 3800 P.S.I. ± 400 this setting is non-
adjustable.
-14-

-15-
SECTION 2 - DIAGNOSIS
CONTENTS
GENERAL INFORMATION 16
TESTING TIPS 16
“RAISE” Troubleshooting 17
“LEAK DOWN” Troubleshooting 18
“LOWER” Troubleshooting 18
“ANGLE LEFT” Troubleshooting 19
“ANGLE RIGHT” Troubleshooting 20
“WILL NOT HOLD ANGLE” Troubleshooting 21
“MOUNTING” Troubleshooting 21
“DIS-MOUNTING” Troubleshooting 21

DIAGNOSTIC FLOW CHART FOR
E-68 Unit
These charts are intended to be used as an aid in diagnosing problems on the E-68 unit. They are not a substitute for factory training and
experience. Be certain to read the General Information and Testing Tips sections before attempting any troubleshooting.
IMPORTANT: Maintenance and repairs must be performed with the moldboard on the ground.
General Information
Before any troubleshooting is started, make certain the following conditions are met.
1. The moldboard is pointing straight ahead. This can often be done by coupling the left cylinder into the right cylinder and
pushing the moldboard by hand.
2. The power angling cylinders must be installed correctly on to the plow assembly. The left cylinder (Driver’s side) has a hose
attached with a female half of a coupler at the end; the right cylinder (Passenger side) has a hose attached with a male half
of a coupler at the end.
3. The solenoid wires must be on their proper coil. The “A” coil (black and tan wires) on power angling block labeled “BLK”. The
“B” coil (red and tan wires) on power angling block labeled “RED”. The “C” coil (green and tan wires) on power angling
block labeled “GRN”. The “D” coil (yellow and tane wires) on power angling block labeled “YEL”. The “E” coil (purple and tan
wires) on power angling block labeled “PUR”.
TESTING TIPS
-16-
Many tests do not require removing the Electro Lift®unit from the vehicle. However, more thorough testing can be
performed using the Meyer Test Stand which allows direct pressure and amperage readings.
1. Using a screwdriver or other small tool to check for magnetism of the solenoid coils “A”, “B”, “C”, “D” and “E”. Place the tool
on the nut securing the coil and have an assistant operate the switch. You should feel strong magnetic attraction.
2. Use a test light or volt meter to determine whether there is power at the harness.
3. When determining AMP draw of the motor, always obtain the highest value possible, i.e, at maximum raise or maximum
angle with motor running.
4. Proper rotation for the motor is indicated by an arrow located on top side of the (Part # 15889) pump.
5. The pump shaft of a good pump can be turned smoothly using two fingers. If it can’t be turn easily, the pump is too tight and
must be replaced.
6. Pump pressure can be measured at an angle hose (note pressure at full angle) or in the pressure filter port (an adaptor is
necessary for the filter port). Note: The E-68 & E-88 Unit has a non adjustable pressure relief valve.
7. Flush the complete system including unit, hoses and power angling rams with Meyer Hydra-Flush™ Fluid M-2.
E-68 CONTROLLER OPERATION
• The snow plow should only be in operation when the vehicle ignition switch and the control switch are in the “ON” position. Care
should be taken to insure that the control switch is kept dry and free from moisture during normal operation.
• When the control switch is turned “On,” the on/off button will illuminate. Individual touch pads operate the functions of the snow
plow: (Up), (Angle Left), (Angle Right), and (Down).
• Lowering of the snow plow an inch at a time is possible by tapping the down arrow in short intervals. Holding down the down arrow
will activate a float light located in the upper right corner of the control switch. This light indicates the snow plow is now in the Lower/
Float position. In this position the snow plow will be able to follow the contour of the road and the snow plow can also be angled to
the left or right. Touching the up arrow automatically cancels the Lower/Float position.
• While angling left or right or raising the snow plow if the button is pressed for more than four seconds the operation will be
cancelled. This feature eliminates unnecessary amp draw from the vehicle charging system.
• The auto lower button when pressed will illuminate the light above it and allows the plow to lower automatically when the vehicle is
shifted into reverse and raise automatically when shifted out of reverse. To turn off the auto lower mode simply press the auto lower
button again.
• The Shake button when pressed will shake the plow left and right for three seconds. This function is used to shake off any snow
which may be stuck to the plow. This function is only available within the last ten seconds of an angle, raise or lower operation. If
you want to cancel shake once it is presses simply press the shake button again.
• The mount button when pressed will allow the mount/dismount switch on the hydraulic unit to mount or dismount the plow at the
same time none of the other function will operate. (angle left, angle right, raise or lower will not work). When the mount button is
pressed again the mount/dismount switch will not work. All plow functions (left, right, raise and lower) will now be available. Once
the mount button is pressed it will only allow the plow to be removed or attached to the vehicle within ten minutes. When the ten
minutes expires the mount/dismount switch will not work. If the mount/dismount switch is pressed for more than ten seconds the
operation will be cancelled. This feature eliminates unnecessary amp draw from the vehicle charging system.
• This switch is self diagnosing. The monitor light is located in the upper left corner next to the float light of the control switch. When
the monitor light turns on and begins to flash the control switch is sensing a problem with a specific coil/connection on the hydraulic
unit. The diagnostic key is on the back side of your control switch.

-17-
SNOW PLOW WILL NOT RAISE
Does the
Motor Operate?
Is there power
going to
the motor?
Are all electrical
connections clean
and tight?
Is Battery Charged?
Charge Battery -
Clean and tighten
all electrical
Connections.
Remove motor.
Does motor run when
12 volts is applied?
Inspect Motor -
Armature, Brushes
Repair or Replace
Motor as necessary
Is there power
going to the
motor solenoid,
at small terminal?
See Switch
Troubleshooting
Can the pump
shaft turn by
hand?
Replace pump.
Replace the
Motor
Solenoid.
Is Ground Cable
attached to the
Negative (-)
Battery Terminal?
Is there pressure
(or flow) at the
Filter port?
Clean or Replace
"A" Valve.
-Retest -
Does snow plow
raise?
Disassemble unit -
Inspect O-rings,
Cylinder,Piston
assembly.
Look for blockage in
Sump Casting
passages.
Is pump relief pressure
adjusted to
2000 +50 P.S.I
Are the
Filters
Clogged?
Clean
or
Replace
Filters.
Check for clogged
strainer - Is oil getting
to the pump?
Clean strainer
and flush the
system completely.
Replace
the
Pump.
NO NO
NO NO
NO
NO
NO
NO
NO NO
NO
NO NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Does the "B" Coil
(Red Wire) have
magnetism?
Are the "B" Valve
O-Rings in good
Condition?
Clean or
Replace the
"B" Valve
and retest.
Replace
Sump Base.
Is there power to
the "B" Coil?
(Red Wire)
at Harness
Replace
"B" Coil.
Is the fluid level
1-1/2" below
filler hole? ADD M-1
Fluid
See Switch
Troubleshooting
Does the
snowplow
raise?
NO
NO
YES
Does the
snowplow
raise?

-18-
SNOW PLOW LEAKS DOWN
Does the
snow plow drop
straight down?
As the snow plow
angles does it drop?
NO
NO
NO
YES
YES
NO
NO
NO
NO
SNOW PLOW WILL NOT LOWER
NO
NO
YES
Replace
"B" Check Valve
Does it now hold?
Replace
"B" Valve
Does it now hold?
Replace
Sump Base
Are "A" Valve O-rings
in good condition?
Does "A" Valve stem
move freely?
Replace O-Rings
Replace "A" Valve
Dissasemble unit
Inspect O-Rings,Cylinder,
Piston Assembly.
Does it hold now?
Replace
Sump Base
Does "A" Coil
(Black Wire) have
magnetism?
Replace "A" Valve
Does it now lower?
Is there power to the
"A" Coil (BlackWire)
at harness? See Switch
Troubleshooting
Replace
"A" Coil
Check for a clogged
filter or a blocked
passageway.
Check for Bent or
Siezed Ram
Assembly.
YES
YES
Replace
"B" Check Valve
Does it now hold?
NO
NO
Check
Lower Adjustment
Screw