Meyer ELECTRO LIFT E-46, ELECTRO LIFT E-46H, ELECTRO LIFT E-47, ELECTRO LIFT E-47H, ELECTRO LIFT E-57 Service Manual

FORM NO. 1-562-R16

October, 2005

Price: $4.25

ELECTRO LIFT

power units

service manual

MODELS

®

E-46, E-46H
E-47, E-47H
E-57, E-57H

18513 Euclid Ave. • Cleveland, OH 44112-1084

Meyer Products Inc.

Phone [phone]

email•[e-mail]

© 2005 Printed in the U.S.A.

6 Angell Lane• Damariscotta, ME 04543-9720

Diamond Equipment

Phone [phone]

www.diamondplow.com • email [e-mail]

FOREWARD

This Service Manual includes complete information for servicing the following Electro Lift® Units:

E - 46 and E - 46H

E - 47 and E - 47H

E - 57 and E - 57H

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 ........................................ 4

2 DIAGNOSIS ............................................................. 23

3 REPAIR PROCEDURE .............................................. 30

4 SPECIFICATIONS ..................................................... 53

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 ........................................... 3

•C

HECK REGULARLY ......................................................... 3

POST-SEASON MAINTENANCE ....................................... 3

•M

EYER HYDRAULIC FLUID M-1 ......................................... 3

•R

EPLACEMENT OF HYDRAULIC FLUID ................................... 3

•F

ILTERS ........................................................................ 3

•P

ROTECTION AGAINST RUST

AND

CORROSION ............................................................ 3

-1-

GENERAL INFORMATION

R

Model Identification

®

The Electro Lift

unit is an electrically powered hydraulic
mechanism specifically designed for use with the Meyer
Snow Plow and is available in four models as follows:

E-46 Raises and lowers plow hydraulically

(2-way) and is used with TM, ST and
C series Snow Plows.

E-46H Raises and lowers plow hydraulically

(2-way) and is used with HM series
Snow Plows.

E-47/E-57 Raises, lowers and angles plow

hydraulically (7-way) and is used with
TM, ST and C series Snow Plows.

E-47H/E-57H Raises, lowers and angles plow

hydraulically (7-way) and is used with
the MDII, HM and Diamond series
Snow Plows.

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.

Motor Identification

Three different brand motors are used on the Electro
Lift® units American Bosch, Prestolite and Iskra.
Proper identification of the brand and supplier part
number is necessary when seeking local parts and
service sources.

The motor with which a specific Electro Lift® unit is
equipped can be identified by the distinctive
characteristics shown in figure 0-2.

DOMED COMMUTA T O
END COVER

STEEL ST AM PED
PRESTOLITE
MKW -4007-12V

FLAT COMMUT ATOR
END COVER

E

T

I

L

O

T

S

E

R

P

3" Dia.

3" Dia.

The basic model number is located on the name plate
located as shown in Figure 0-1. To determine whether
it is the standard or “H” model, measure the dimension
shown in Figure 0-1. The serial number is located on
the bottom of the base or on the name plate.

NAME PLATE

"

8

/

1

-

8
H

7

5

­E

,
H

7

4

­E

,
H

6

4

­E

"

4

/

1

-

6

7

5

­E

,

7

4

­E

,

6

4

­E

STEEL ST AMP ED
AMERICAN BOSCH
MO 551046A

ISKRA
Label 15829

AMJ4739 12V 1,6kw

SINGLE and TWO TERMINAL

4-1/2" Dia.

FIGURE 0-2

MAINTENANCE

The following maintenance information is intended as
a basic guide for providing the Electro Lift

®

unit with
the proper service and care. Sustained heavy duty
operation or operating under adverse conditions may
necessitate more frequent servicing.

xxxxx

FRONT VIEW

SERIAL NUMBER
(ON FRONT SIDE)

FIGURE 0 -1

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-

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.

FILLER PLUG

DRAIN PLUG

FILTER S

FIGURE 0-3

LIFT ROD

D

R

A

I

N

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.

Replacement of Hydraulic Fluid

After a season’s use, completely drain the hydraulic
fluid (including hydraulic fluid in hoses and cylinders
on Power Angling models). Drain fluid through filler
hole shown in Figure 0-3 or drain hole in base by
completely retracting lift rod and unbolting unit to pour
fluid out or using a suction pump. On Power Angling
models, disconnect the fittings at the Angling cylinders,
completely retract the cylinder rods and purge
cylinders and hoses of all hydraulic fluid. Flush the
complete system including unit, hoses and Power
Angling rams with 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 a (Napthenic) based cleaner that is wax free .

Refill Electro Lift

®

unit with M-1 Fluid by fully
retracting lift rod (Ram) and filling reservoir to 1-1/2
“ below the filler hole. On Power Angling models,
fill and bleed hoses and Power Angling 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.

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 (only one in E-46 and E-46H; two
in Power Angling units) located in base of unit with
mineral spirits or equivalent and blow out with
compressed air. See Figure 0-3 for filter locations.

Protection Against Rust and Corrosion

When the Electro Lift® 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. On Power Angling models, coat the
exposed portions of the Power Angling cylinder rods
(Rams) with chassis lubricant to protect them against
rust and corrosion.

-3-

SECTION 1 - GENERAL DESCRIPTION AND THEORY OF OPERATION

CONTENTS

GENERAL DESCRIPTION ................................................................................................. 5

THEORY OF OPERATION................................................................................................. 5

UNCTIONS .................................................................................................................. 5

•F

•• Models E-46 and E-46H ................................................................................... 5

•• Models E-47, E-47H and E-57, E-57H ........................................................... 5

•ELECTRICAL AND FLOW CHARTS ...................................................................................... 6-18

ELECTRO LIFT® UNIT COMPONENTS ......................................................................... 19

•M

OTORS ...................................................................................................................... 19

•• American Bosch ............................................................................................... 19

•• Prestolite ............................................................................................................ 19

•• Iskra .................................................................................................................... 19

YDRAULIC PUMP .......................................................................................................... 19

•H

•P

RESSURE RELIEF VALVE ................................................................................................ 19-20

OLENOID VALVES ......................................................................................................... 20

•S

•• Cartridge ............................................................................................................ 20

•• Coil...................................................................................................................... 20

“A” Solenoid Valve............................................................................................. 20

“B” Solenoid Valve............................................................................................ 20

“C” Solenoid Valve ........................................................................................... 20

•CHECK VALVES .............................................................................................................. 21

•P

ILOT CHECK VALVE ...................................................................................................... 21

•C

ROSSOVER RELIEF VALVES ............................................................................................ 21

WITCH (MODELS E-46 AND E-46H) ............................................................................ 21

•S

•S

WITCHES (POWER ANGLING MODELS) ............................................................................ 21

•• Dual Switch Control ........................................................................................... 21-22

•• Single Lever Control .......................................................................................... 22

•• Electro-Touch Control......................................................................................... 22

•S

OLENOID SWITCH ........................................................................................................ 22

ILTERS ....................................................................................................................... 22

•F

-4-

GENERAL DESCRIPTION

THEORY OF OPERATION

Electro Lift® unit is an electrically powered and
electrically controlled hydraulic mechanism specifically
designed for use with Meyer Snow Plows. The standard
model E-46 raises and lowers the plow hydraulically
with an integral 6" stroke hydraulic cylinder while the
model E-46H performs the identical task for larger plows
with an integral 8" stroke hydraulic cylinder.

In addition to raising and lowering the plow
hydraulically, the model E-47, E-47H and
E-57, E-57H 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.

Included in all models is an electrically controlled and
powered solenoid valve cartridge “A” which is
energized to allow the plow to lower by gravity.

The models E-47 and E-57 include an integral valve
body which contains two additional electrically
controlled solenoid valve cartridges. 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. Angling
the plow to the left only requires energizing the electric
motor since the normal route for the pressurized
hydraulic fluid is to the right remote hydraulic cylinder.

FUNCTIONS

®

The Electro Lift

models perform basic functions.
Because certain of these basic functions are
accomplished differently in the models E-46 and
E-46H as opposed to the Power Angling models will
be treated separately where necessary.

Models E-46 and E-46H

The two basic functions performed are:

• Raise snow plow

• Lower snow plow and float

Refer to Figures 1-1 and 1-2 (pages 6 thru 9) for
electrical and hydraulic flow chart for each function.
Each figure explains which component is actuated and
related in each function.

Models E-47, E-47H and E-57, E-57H

The four basic functions performed are:

• Raise snow plow

• Lower snow plow

• Angle snow plow to right

• Angle snow plow to left

Refer to Figures 1-3 through 1-6 (pages 6 thru 18) for
electrical and hydraulic flow chart for each function.
Each figure explains which component is actuated and
related in each function.

Additional components which control and supply
electrical current to the Electro Lift® unit are an operator
controlled toggle switch; a solenoid switch to supply
high amperage current to the unit’s motor; a wiring
harness to distribute low amperage current between
the toggle switch or switches, motor solenoid and the
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.

-5-

-

RAISE

SWITCH

IGNITION

LOWER

SWITCH

RAISE &

FUSE

BLACK

WHITE

+

BATTERY

SOLENOID

FIGURE 1-1A

SWITCH

MOTOR

A

BLACK

-6-

- OPE R ATING

- RETURN

- INTAKE or DRAIN

RAISE

HYDRAULIC FLOW CHART

MODELS E-46 & E-46H

TANK

PRESSURE

RE L IEF

E-46 & E-46H

1650 + 50 P.S.I.

CHECK VALVE

LIFT

CYLINDER

FILTER

STRAINER

FIGURE 1-1B

"A"

-7-

SOLENOID

SWITCH

IGNITION

FUSE

BLACK

-

+

WHITE

BATTERY

FIGURE 1-2A

LOWER/FLOAT

SWITCH

SOLENOID

SWITCH

RAISE &

MOTOR

LOWER

A

BLACK

-8-

- OPERATING

- RET U RN

- INTAKE or DRAIN

HYDRAULIC FLOW CHART

LOW ER/FLOA T

MOD ELS E-46 & E-46H

TANK

PRESSURE

RE L IEF

E-46 & E-46H

1650 + 50 P.S.I.

CHECK VALVE

LIFT

CYLINDER

"A"

SOLENOID

ENERGIZED

FILTER

STRAINER

FIGURE 1-2B

-9-

SL IK - STIKSINGLE LEVER

CONTROLLER

GROUND

(BLUE WIRE)

(ORANGE WIRE)

POWER TO SWITCH

6

3

ELECTRO -TO UCH

CONT R OLLE R

(BLACK WIRE)

(GREEN WIRE)

TO "A" SOLENOID

TO "C" SOLENOID

(WHITE WIRE)

TO MOTOR SOLENOID

4

5

2

1

(RED WIRE)

TO "B" SOLENOID

"B"

N

N

I

I
A

A
R

R

D

D

RAISE

Ignition Switch

RAISE

D1NEGATIVE

A2POSITVE

WHITE WIRE - ENERGIZED

Moto r Solenoid

L

E

E

S

N

U

"ON"

F

10

A
P

H
C

T

I
W

E

S

R

I

O

W

T

E

R

U

E

L
B

W
O

1

0

A

P

GENUINE PARTS

C - H

C - H

Meyer

Meyer

F

H

F

C

O

T

/

I

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W
S

O

E
V

I

1

T

D

A
G
E
N

2
A

"
B

"

E
V
T

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S
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P

.

D

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Z

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R

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N

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s

i

d

i

o

en

l

o

S

"

B

"

e
r

i

w

d
e

R

N

N

I

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A

A
R

R

D

D

D
E
R

FIGURE 1-3A

FIGURE 1-3A

D

E

N

R

I

U

W

O

R

E

G

L

G

E

END OF TOUCH PAD HARNESS

E

N

H

S

N

A

C

U

A

"ON"

Ignition S w itc h

R

T

F

I

P

O

W
S

G

E

N

Y

R

E

S

T

O

T

P

A

B

D
N
U
O
R
G

E

E

T

I

R

I

H

W

W

R
E

W
O
P

-10-

POWER ANGLING

CYLINDERS

RAISE

HYDRAULIC FLOW CHART

M ODELS E - 4 7 & E-57

- OPERATING

- RETURN

CROSSOVER

REL IEF

3800 + 400 P.S. I

"C"

SOLENOID

PILOT

CHECK

VALVE

CHECK

- INTAKE or DRAIN

FIGURE 1-3B

"B"

SOLENOID

ENERGIZED

FILTER

TANK

PRESSURE

RELIEF

E-47

1650 + 50 P.S. I.

E-57

2000 + 0 P.S. I.

CHECK VAL VE

LIFT

CYLINDER

FILTER

STRAINER

"A"

SOLENOID

-11-

S

S

TIK

LIK -

SINGLE LEVER

CONTROLLER

LOWE R/FLOA T

d

i
o
n
e

l
o
S
"
A

"
e

r

i
w
k

c
a

l
B

.

D

E

Z

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R

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N

E

s

i

d

i

o

n

e

l

o

S

"

A

"

e

r

i

w

10

"ON"

Ignition Sw itc h

GENUINE PARTS

C - H

C - H

Meyer

Meyer

k

c

a

l

B

FIGURE 1-4A

ELECTRO -TOUCH

CONTROLLER

GROUND

(BLUE WIRE)

(ORANGE WIRE)

POWER TO SWITCH

TO MOTOR SOLENOID

5

6

2

3

(BLACK WIRE)

(GREEN WIRE)

TO "A" SOLENOID

TO "B" SOLENOID

TO "C" SOLENOID

E
V

I

1

T

D

A
G
E

E

N

V

T

2

F

H

F

C

O

T

/

I
W

N

S

H
C
T

(WHITE WIRE)

LOWE R/FLOA T

4

I

W
S

TO
R

E
W
O

1

0

A

P

O

E
R

I
W
E

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L

B

I

A

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A

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W

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B

K
C
A

L
B

1

D

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N

R

I

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W

O

END OF TOUCH PAD HARNESS

"ON"

(RED WIRE)

Ignition Switch

R

E

G

L

G

E

E

N

H

S

N

A

C

U

A

R

T

F

I

P

O

W
S

G

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N

Y

R

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T

S
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P

A

B

D
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G

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E

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I

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W

W

R
E

W
O
P

FIGURE 1-4A

-12-

POWER ANGLING

CYLINDERS

- OPERATING

- RETURN

CROSSOVER

RE LIEF

3800 + 400 P.S.I

"C"

SOLENOID

PILOT

CHECK

VALVE

CHECK

- INTAKE o r DRAIN

HYDRAULIC FLOW CHART

LOW ER/FLOA T

MODELS E-4 7 & E-57

FIGURE 1-4B

"B"

SOLENOID

FILTER

TANK

PRESSURE

RELIEF

E-4 7

1650 + 50 P.S.I.

E-5 7

2000 + 0 P.S.I.

CHECK V ALVE

LIF T

CYLINDER

FILTER

STRAINER

-13-

"A"

SOLENOID

ENERGIZED

SLIK - S T IKSINGLE LEVER

ELECTRO -TOUCH

CONT R OLLER

CONTROLLER

GROUND

(ORANGE WIRE)

(BLACK WIRE)

TO "A" SOLENOID

(BLUE WIRE)

(WHITE WIRE)

POWER TO SWITCH

TO MOTOR SOLENOID

5

6

2

3

(RED WIRE)

(GREEN WIRE)

TO "B" SOLENOID

TO "C" SOLENOID

"C"

N

N

I

I
A

A

R

R
D

D

D1NEGATIVE

A2POSITVE

e
r

i

w

n

RIGHT ANGLE

L

E

E

S

N

U

A

"ON"

F

P

Ignition Switch

RIGHT ANGLE

4

1

0

A

H
TC

I

WHITE WIRE - ENERGIZED

Motor Solenoid

10

W

E

S

R

I

O

W

T

E

R

U

E

L
B

W
O
P

GENUINE PARTS

C - H

C - H

Meyer

Meyer

F

H

F
O

TC

/

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N

S

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1

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D

A
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V
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2

I

A

S
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P

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G

"
B

"

N

N

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A

A

R

R
D

D

1

D

E

N

R

I

U

W

O
R

E

G

L

G

END OF TOUCH PAD HARNESS

E

E

N

H

S

N

A

U

A

"ON"

Ignition Switch

R

TC

F

I

P

O

W
S

G

E

N

Y

R

E

T

S

O

T

P

A

B

D
N
U
O
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G

E

E

T

I

R

I

H

W

W

R
E

W
O

P

.

D

E

Z

I

G

R

E

N

E

s

i

d

i

o

n

e

l

o

S

"

C

"

FIGURE 1-5A

N
E
E
R
G

FIGURE 1-5A

-14-

POWER ANGLING

CYLINDERS

HYDRAULIC FLOW CHART

MODELS E-47 & E-57

- OPE R ATING

- RETURN

CROSSOVER

RELIEF

3800 + 400 P.S.I

"C"

SOLENOID

ENERGIZED

PILOT

CHECK

CHECK

VALVE

- INTAKE o r D R A IN

ANGLE RIGHT

FIGURE 1-5B

"B"

SOLENOID

NOT

ENERGIZED

FILTER

TANK

PRESSURE

RELIEF

E-4 7

1650 + 50 P.S.I.

E-5 7

2000 + 0 P.S.I.

CHECK VALVE

LIFT

CYLINDER

FILTER

STRAINER

"A"

SOLENOID

-15-

D1NEGATIVE

A2POSITVE

"C"

N

N

I

I
A

A

R

R
D

D

FIGURE 1-6A

SLIK - S T IKSINGLE LEVER

ELECTRO -TOUCH

CONT R OLLER

CONTROLLER

GROUND

(ORANGE WIRE)

(BLACK WIRE)

TO "A" SOLENOID

POWER TO SWITCH

TO "C" SOLENOID

6

3

(BLUE WIRE)

(GREEN WIRE)

LEFT ANGLE

L

E

E

S

N

U

A

"ON"

F

P

Ignition Switch

(WHITE WIRE)

TO MOTOR SOLENOID

LEFT ANGLE

4

5

2

1

END OF TOUCH PAD HARNESS

(RED WIRE)

TO "B" SOLENOID

1

0

A

E
S
U

"ON"

F

Ignition Switch

WHITE WIRE - ENERGIZED

Motor Solenoid

H
TC

I

10

W

E

S

R

I

O

W

T

E

R

U

E

L
B

W
O
P

GENUINE PARTS

C - H

C - H

Meyer

Meyer

F

H

F
O

TC

/

I

W

N

S

O

E
V

I

1

T

D

A
G
E
N

2
A

"
B

"

N

N

I

I
A

A

R

R
D

D

E
V
T

I
S
O
P

FIGURE 1-6A

D

E

N

R

I

U

W

O
R

E

G

L

G

E

N

H

N

A

A

R

TC

I

P

O

W
S

G

E

N

Y

R

E

T

S

O

T

P

A

B

D
N
U
O
R
G

E

E

T

I

R

I

H

W

W

R
E

W
O

P

-16-

POWER ANG LING

CYLINDERS

ANG LE LEFT

HYDRAULIC FLOW CHART

MODELS E-4 7 & E-57

- OPERATING

- RETURN

CROSSOVER

REL I E F

3800 + 400 P.S. I

NOT

"C"

SOLENOID

"B"

SOLENOID

ENERGIZED

PILOT

CHECK

CHECK

VALVE

NOT

ENERGIZED

- INTAKE or DRAIN

FILTER

TANK

FIGURE 1-6B

PRESSURE

RE L IE F

E-47

1650 + 50 P.S. I.

E-57

2000 + 0 P.S.I.

CHECK VALVE

LIFT

CYLINDER

FILTER

STRAINER

"A"

SOLENOID

-17-

-

-

BATTERY

+

SWITCH

IGNITION

FUSE

BLACK

WHITE

WHITE

SWITCH

SWITCH ANGLE

BLACK

&

RAISE

LOWER

GREEN

WHITE

RED

SWITCH

SOLENOID

MOTOR

BLACK

LOWER/FLOAT

C

B

A

WHITE

SWITCH

IGNITION

FUSE

BLACK

WHITE

SWITCH

SWITCH ANGLE

&

RAISE

BLACK

LOWER

BATTERY

+

ANGLE RIGHT

SWITCH

SOLENOID

MOTOR

C

GREEN

B

WHITE

RED

A

BLACK

-

BATTERY

+

SWITCH

IGNITION

FUSE

BLACK

WHITE

WHITE

SWITCH

&

RAISE

SWITCH ANGLE

LOWER

GREEN

BLACK

WHITE

SWITCH

SOLENOID

MOTOR

RED

BLACK

RAISE

C

B

A

WHITE

SWITCH

IGNITION

BLACK

WHITE

SWITCH

SWITCH ANGLE

BLACK

&

RAISE

LOWER

-

BATTERY

+

ANGLE LEFT

FUSE

GREEN

WHITE

SOLENOID

RED

SWITCH

MOTOR

C

B

A

BLACK

DUAL SWITCH WIRING

-18-

ELECTRO LIFT® UNIT COMPONENTS

ELECTRO LIFT® UNIT COMPONENTS

MOTORS ( 3”) E-46, E-46H and E-47, E-47H

The 12-volt DC high torque motor used on the Electro

®

Lift

units are interchangeable among all four models.
Its function in all four applications is to drive the
hydraulic pump. The motor is only energized and
operating when pressurized hydraulic fluid is required.

Two different brand motors were used. While they are
interchangeable and have nearly identical performance
characteristics, they have distinctive design differences.

American Bosch

The American Bosch motor is a four pole, permanent
magnet motor which consists primarily of a 3" diameter
solid steel frame, armature, brushes and ceramic
permanent magnet fields. Because the fields are
permanent magnets, they do not require electrical
current to operate. Therefore, the motor requires lower
amperage to produce a given amount of power.

Electro Lift® units equipped with an American Bosch
motor cannot be used on vehicles with a positive
ground electrical system since the motor will rotate
backwards. Positive ground vehicles will require
modification of the brush assembly.

Prestolite - (obsolete)

MOTOR (4-1/2”) E-57, E-57H

Iskra - Single and 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
Electro Lift® unit) to the liquid in the hydraulic system.

The basic operating principles of the hydraulic pump
used in the Electro Lift® units are quite simple. Figure
1-7 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.

RESERVOIR

ELECTRIC

MOTOR

F

L

O

W

DRIVE GEAR

OUTLET LINE

INTAKE LINE

DRIVEN GEAR

PUMP CHAMBER

PUMP HOUSING

F

L

O

W

FIGURE 1-7

PRESSURE RELIEF VALVE

A basic pressure relief valve is shown in
Figure 1-8. 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.

OUTLET PORT

POPPET

VALVE

VALVE

SPRING

PUMP HOUSING

INLET PORT

FIGURE 1-8

-19-

ELECTRO LIFT® UNIT COMPONENTS CONT.

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 Electro Lift® pump,
while more sophisticated than the one described,
functions in the same manner. The pump pressure relief
valve may be adjusted on the E-46 & E-47 models to
the specified pressure of 1650 P.S.I. by adjusting the
set screw after installing a suitable pressure gauge of
2500 P.S.I. in the circuit. Note: The E-57 Model has a
nonadjustable pressure relief valve and is factory set
to 2000 P.S.I.

SOLENOID VALVES

Hydraulic valves are simple in concept and all have
the same basic function: Control the direction of oil
flow. One type of Solenoid Valve is used on the models
E-46 and E-46H and three types are used on models
that Power Angle.

Each Solenoid Valve consists of two components: the
Cartridge and the Coil.

WINDING

COIL

ARMATURE

VALVE SPOOL

FIGURE 1-9

“A” Solenoid Valve

The “A” Solenoid Valve is used in all Models. The “A”
Cartridge contains a poppet valve whose static or
de-energized position is closed. Its energized position
is open.

On all four models, 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.

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 Electro Lift

®

units much like the

typical “spark plug”.

Coil

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 1-9 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.

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

The “B” Solenoid Valve is used on the Power Angle
Electro Lift® models. The “B” Cartridge contains a
spool valve whose static (de-energized) position allows
the pressurized hydraulic fluid to flow to the
“C” Solenoid Valve. In the energized position, the
pressurized hydraulic fluid is diverted to the lift cylinder,
raising the plow.

“C” Solenoid Valve

The “C” Solenoid valve is used on the Power Angle
Electro Lift® models. The “C” Cartridge contains a
spool valve whose static (de-energized) position allows
the pressurized hydraulic fluid to flow to the right power
angling cylinder which angles the plow to the left. At
the same time, it allows the hydraulic fluid being forced
from the retracting left power angling cylinder to flow
through the “C” Cartridge back to the reservoir.

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 back to the
reservoir.

-20-

CHECK VALVES

ELECTRO LIFT® UNIT COMPONENTS CONT.

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 all four Power Angling models a pump check valve
is used to prevent hydraulic fluid from leaking back
through the pump to the reservoir. Its function on the
E-46 and E-46H models is more critical since it is the
only means by which pressurized hydraulic fluid
pumped into the lift cylinder is prevented from leaking
out through the pump, causing the plow to slowly come
down.

The E-47 and E-57 models incorporate two additional
check valves, necessary because the “B” and “C”
Solenoid Valves, being spool valves, have some
leakage.

One check valve is 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 weight of the
plow to angle the plow to the left by forcing hydraulic
fluid through the “C” Solenoid Valve into the right power
angling cylinder.

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 may be adjusted to the
specified pressure of 3800 P.S.I. ± 400 by turning the
3/8” hex cap screw after installing a suitable pressure
gauge of 4000 P.S.I. in the circuit. TIGHTEN (TURN IN)
ADJUSTMENT SCREW TO INCREASE PRESSURE.
See Figure 3-63. Disassembly/ Reassembly figures
3-42 thru 3-62.

SWITCH

(Models E-46 and E-46H)

The other check valve is located between the “B” and
“C” Solenoid Valves. It prevents the hydraulic fluid in
either power angling cylinder from being forced
through the “B” Solenoid Valve to the left cylinder.

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” Solenoid Valve
and reservoir. 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.

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.

A single three-position toggle switch Is used on the
E-46 and E-46H models. The positions are:

• Off (Center Position)

• Raise (Up Position)

• Lower and Float (Down Position)

In the “off” position, the switch conveys no current.

In the “raise” position, the switch conveys current to
the solenoid switch. When released, an internal spring
returns the toggle to the “off” position.

In the “lower and float” position, the switch conveys
current to the “A” Solenoid Valve. When released, the
toggle will stay in the “lower and float” position. The
toggle must be manually returned to the “off”
position.

SWITCHES (Power Angling Models)

Dual Switch Control

Two three-position toggle switches are used on the
E-47 and E-47H models. The first, to raise and lower
the plow, has the same positions as the toggle switch
used on the E-46 and E-46 H models. However,
because it functions differently, it is a completely
different switch.

In the “off” position, the switch conveys no current.

In the “raise” position, the switch conveys current
to the solenoid switch and the “B” Solenoid Valve.
When released, an internal spring returns the toggle
to the “off” position.

-21-

ELECTRO LIFT® UNIT COMPONENTS CONT.

SWITCHES (Power Angling Models) Cont.

Dual Switch Control

The second toggle switch is to angle the plow. The
positions are:

•Off (Center Position)

•Angle Left (Left Position)

•Angle Right (Right Position)

In the “off” position, the switch conveys no current.

In the “angle left” position, the switch conveys
current to the solenoid switch. When released, an
internal spring returns the toggle to the “off”
position.

In the “angle right” position, the switch conveys
current to the solenoid switch and to the “C”
Solenoid Valve. When released, an internal spring
returns the toggle to the “off” position.

Single Lever Control

A single lever control is also used on the Electro

®

Lift

models. This switch (five-position) functions the
same as the two three-position toggle switches
previously discussed.

Electro-Touch® Control Pad

IMPORTANT:

The power lead to the switch should be connected
to a terminal on the fuse panel that is HOT ONLY
when the ignition switch is in the “ON” position.

When the control switch is powered up, yellow lights
illuminate the arrows of the individual functions. The
up arrow for raise, the left arrow for angle left, the
right arrow for angle right and the down arrow for
lower or float.

Holding the down arrow for a full second will activate
a light located in the upper left corner of the
Electro-Touch® switch. This light indicates the snow
plow is now in the 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 will automatically
cancel the float position.

CAUTION: When the snow plow is not in operation,
the Electro-Touch

®

Control Switch should be in the

“OFF” position.

SOLENOID SWITCH

®

The Electro Lift

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 Electro Lift

®

units are equipped with a filter

system consisting of:

E-46 E-47, E-57

E-46H E-47H, E-57H

X X A fine screen strainer on the

reservoir pump inlet.

X X A filter screen between the lift

cylinder and “A” Solenoid Valve.

X A high pressure filter on the pressure

side of the pump.

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 “A” Solenoid Valve reliability, the
hydraulic fluid leaving the lift cylinder is filtered
before passing through the “A” Solenoid Valve. The
filter screen and high pressure filter are easily
removed for periodic cleaning or replacement.

This switch is short circuit, open circuit and
temperature protected. If any of these conditions
exists, the overload light will illuminate. The overload
light is located just below the float light in the upper
left corner of the Touch Pad. Reset is accomplished
by cycling the power to the Touch Pad via the on/
off switch located to the left of the cord as it enters
the Touch Pad.

NOTE: Additional filter screens are added to the
“A”, “B” and “C” Cartridge Valves.

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 and hoses) should be
flushed. Flush the system with Meyer Hydra-Flush™
Fluid M-2.

-22-

SECTION 2 - DIAGNOSIS

CONTENTS

GENERAL INFORMATION............................................................................ 24

TESTING TIPS ............................................................................................... 24

“RAISE” Troubleshooting ............................................................................. 25

“LEAK DOWN” Troubleshooting ................................................................. 26

“LOWER” Troubleshooting .......................................................................... 26

“ANGLE LEFT” Troubleshooting.................................................................. 27

“ANGLE RIGHT” Troubleshooting ............................................................... 28

“WILL NOT HOLD ANGLE” Troubleshooting ............................................ 29

“CROSSOVER RELIEF VALVE” Flow Chart............................................... 29

-23-

DIAGNOSTIC FLOW CHART FOR

E-46, E-47 and E-57 ELECTRO LIFT® UNITS

These charts are intended to be used as an aid in diagnosing problems on the Electro Lift® units. 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 A- frame. The left cylinder (Driver’s side) has a hose
attached with a male half of a coupler at the end; the right cylinder (Passenger side) has a hose attached with a female half
of a coupler at the end.

3. The solenoid coils must be on their proper valve. The “C” coil (green wire) must be next to angling fittings. The “B” coil
(red wire) is located to the front of the Electro Lift® Unit. The “A” coil (black wire) is smaller and is located on the back side
of the unit. (See Drawing).

TESTING TIPS

Many tests do not require removing the Electro Lift® unit from the vehicle. However, more thorough testing can be per-

formed 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”. 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 or switch. The current 22154 Electro-Touch

Control has been redesigned. Note: The Electro-Touch Controller now has raised buttons and its circuitry has been changed
from analog to digital, functions have not changed. For troubleshooting for power at the solenoids do not disconnect wires.
To check for power, prick the wire through the insulation for testing. The control knows when a short or an open connection
occurs and will go into overload mode for the function being activated. To reset the controller turn the switch on and off. The
Electro-Touch Control will not operate if not wired properly. Controller must be grounded, Orange wire from switch harness
attaches to the negative terminal of the battery. Reference Form 1-795 for wiring diagram.

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 3” motor (American Bosch) is indicated by an arrow located on top side of the (Part # 15026) 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-57 Electro Lift® 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.

To Ignition Switch
(Accessory Side)

FUSE

22092

20A

White

Motor Solenoid

(Must be grounded)

15680

D

R

A

I

D

R

A

I

N

P

N

L

U

G

F

I

L

T

E

R

S

Coupler

Weather Cap

To P a s s e n ge r S i d e
Power Angling Ram.
(Angle Left)

Pressure Relief
Filler Plug

"B"

G

R

E

R

E

E

N

D

"

"

B

C

"

"

B

L

A

C

K

"

A

"

To D ri v e r ' s S id e

"C"

Coupler
Weather Plug

"A"

Ground

A2

NE

B

A

T

T

E

+

-

To Motor

G

P

O

S

R

Y

D1

To Positive
Battery Terminal

Power Angling Ram.
(Angle Right)

-24-

SNO

W PLOW WILL NOT RAISE

Does th e
Motor Operate?

YES

Is the fluid level
1-1/2" below
filler hole?

YES

Does the snow plow
angle to the left
instead of raising?

YES

NO

Is there power
going to
the mo to r?

YES

Remo v e motor .
Does motor run when
12 volts is applied?

YES

Can the pump
shaft turn by
hand?

YES

Replace pump.

NO

ADD M-1
Fluid

Does the snow plow

NO

angle when the
An g le S witch
is activate d ?

YES

Clean or Replace
"A" Valve.

-Retest -
Does snow plow
raise?

NO

YES

Is the "A" V alve
stuck in the
open position?

Disassemble unit ­ Inspect O-rings,

NO

Cylinder,Piston
assembly .
Look for blockage in
Sump Casting
passages.

NO

Inspec t M o to r -

NO NO

Armature, Brushes
Repair or Replace
Motor as necessary

Is Ground Cable
attached to the
Negative (-)
Battery Terminal?

NO

Is there pressure
(or flow) at the
Filter port?

YES

Can pump relief pressure
be adjusted to
1650 +
E-46 & E-47

Are all electrical
connections clean
and tight?
Is Battery Charged?

NO

YES

Is there power
Is there power
going to the
motor solenoid,
at White Wire?

NO

leaving the

switch?

Check switch

for Continuity

YES YES

Replace the
Motor
Solenoid.

Are the

NO NO

Filters
Clogged?

YES

Clean
or
Replace
Filters.

NO

50 P.S.I

YES

Charge Battery ­Clean and tighten
all electrical
Connections.

Replace the
Wiring
Harness.

Is the moto r tu rnin g
the proper direction?

NO

Check for clogged
strainer - Is oil getting
to the pump?

YES

Is the pump
shaft turning
tightly?

Replace
the
Pump.

NO

Replace
the
Pump.

NO

Check Wires at
Molded connector.

YES

Is the Fuse
OK?

YES

Replace the
Raise
Switch .

NO

NO

Does the motor
armatu re tu rn
tightly?

YES

Repair or Replace
the mot o r.

Replace Fuse.
Check for short

NO

in Harness,
"B" Coil, Switch
Connections,
Motor Solenoid,
Electric Motor .

Check Brushes for
proper installation or
replace motor.

Clean strainer
and flush the
system completely.

Does the "B" Coil
(Red W ire ) h av e
magnetism?

NO

YES

Are the "B" Valve
O-Rings in good
Conditio n?

NO

Replace
O-Rings.

YES

Replace P .A. Block

Clean or
Replace the
"B" Valve
and retest.

NO

with E-46 plate and
retest. - Does snow
plow Raise now?

YES

Replace
P.A. Bl ock

NO

Replace
Sump Base.

Is there power to
the "B" Coil?
(Red Wire)
at Harness

YES

Replace
"B" Coil.

NO

-25-

Is there power
leaving the switch
at the red wire?

YES

Replace
the wiring
harness.

NO

Are wires in
molded connector
making contact
with the switch?

YES

Replace
the Raise
switch.

SNOW PLOW LEAKS DOW N

Does th e

NO

snow plow drop
straight down?

YES

Are "A" Valve O-rings
in good condition?
Does "A" Valve stem
move fr e e ly?

YES

E-47: Dissasemble unit
Inspect O-Rings,Cylinder,
Piston Assemb ly.
Doe s it hold no w?

NO

NO

Does the snow plow
drop and angle
to the le ft?

YES

Replace
"B" Check Valve
Does it now hold?

Replace O-Rings
Replace "A" Valve

"E- 4 6 ONLY"
Replace Pump Check Valve
(Rem e mber to c o in th e b a ll to th e se a t).
Does it now Hold?

NO

Replace
Sump Base

NO

Replace
"B" Valve
Does it now hold?

NO

NO

Dissasemble unit
Inspect O-Rings,Cylinder,
Piston A ssembly.
Doe s it h o ld n o w?

Replace
Sump Base

NO

Replace
Sump Base

Does "A " Coil
(Black Wire) have
magnetism?

YES

Replace "A" Va lve
Does it now lower?

SNOW PLOW W ILL NOT LOW ER

NO

Is there power to the
"A" C oil (Bla c k Wire)
at harness?

NO

Check for a clogged
filter or a blocked
passageway.

YES

Replace
"A" Coil

NO

Is there power leaving
the switch at th e
Black Wire?

YES

NO

Check for Bent or
Siezed Ram
Assembly.

Replace
Harness

-26-

NO

A re wires in molde d
connector making contact
with th e switch ?

YES

Is Fuse
OK?

YES

Replace
Switch

NO

Replace the fuse ­Check for short in
harness, "A" Coil,
Switch connections.

SNO

Can the snow plow
Raise?

YES

Does th e motor run
when angle switch
is pushed?

NO

NO

W PLOW WILL NOT ANGLE LEFT

See the Raise
Flow C h a rt
Section

Are the wires in

Is there p o w er to
the motor solenoid?
(White Wire)

NO

Is there power
leaving the switch?

YES

NO

molded connector
making contact with
the switc h ?

YES

YES

Does the snow plow
raise instead of
angling left?

YES

Clean or replace the
"B" Valve.
Retes t

Does the snow plow

NO

angle to the right when
the angle switch is
pushed left?

YES

Clean or replace the
"C" Valve.
Retes t

Replace Harness

Is the ampere draw

NO

less than 100 amperes
while trying to angle
snow p lo w?

YES

Is the Pilo t p is to n in

NO

good condition?
(worn/sloppy or Missing)

YES

Are "C" Valve
O-Rings in good
condition?

YES

Clean or replace
the Crossover Relief.
Does the snow plow
now an gle?

NO

NO

NO

NO

Replace
Piston

Replace
O-Rings

Replace the
P .A. Block

Replace Angle
Switch

Can the snow plow be
angled by hand when
the P.A. Rams a re
disconnected from A-Frame?

YES

Will the snow plow angle
right & left if n o t allo wed
to travel to e x tre me
angled position?

YES

T em porarily put 1/2" blocks
between the Sector and
A-Frame to limit the degree
of angle. Will the snow plow
now angle?

Weld
1-1/2" x 1-1/2" x 1/2"
spacers to the A-Frame
stops.

YES

Relieve the interference

NO

between the
Sector and A-Frame.

NO

Does pressure remain
in angle hose when the
motor is not running?

YES

If both hoses are stiff
inspect the Pilot Check
Piston and "C" Valve
for bindin g .

Replace both the

NO

Coupler sets and/or
clean or replace the
"C" Valve.

If one hose is stiff
inspect the the "C"
valve for binding.
Replace Coupler sets.

-27-

SNOW PLOW WILL NOT ANGLE RIGHT

Can the snow plow
Raise ?

YES

Does the motor run
when angle switch
is pushed?

YES

Does the snow plow
raise ins te a d of
angling le ft?

YES

Clean or replace the
"B" Valve.
Rete st

NO

NO

Is there p o wer to
the motor solenoid?
(White Wire)

NO

Can the snow plow
angle to the Left?

Does the "C" Coil
have magnetism?
(Green Wire)

See the Raise
Flow Chart
Section

YES

NO

Is there p o wer
leaving the switch?

YES

Replace Harness

Is there p o wer to

NO

the "C " C oil?
(Green wire at harness)

YES

NO

NO

Are the wires in
molded connector
making contact with
the switch?

YES

Replace Angle
Switch

Is there power
leaving the switch?

YES

NO

Are the wires in
molded connector
making contact with
the sw itc h ?

YES

YES

Are "C" Valve
O-Rings in good
condition?

YES

Clean or replace
the Crossover Relief.
Does the snow plow
now angle?

NO

Replace the
"C" Coil.
Retes t

Replace
O-Rings

Replace both the
Coupler sets and/or
clean or replace the
"C" Valve.

NO

Replace Harness

Replace the
P.A. Block

Replace Angle
Switch

-28-

SNOW PLOW WILL NOT HOLD ANGLE

Are the Rams mushy?
Can you push the moldboard
6" to 8" by h a n d?

YES

Bleed air from the system
and snug up gland nuts.
Check couplers and fittings
for leak s.

"B"
SOLENOID

NO

Does the moldboard
hold left angle & release
from rig ht angle ?

YES

Inspect "C" Valve O-rings
Change if necessary. Does
snow plow now angle?

Are the "C" Valve

NO

O-Rings in poor
cond itio n ?

YES

Replace O-Rings

Change Pilot Check

NO

Ball a n d Seat.
does snowplow
now hold?

Is Crossover Relief set

NO

at 3800 +
Are Crossover O-Rings
in go od co n dition?

Inspect Crossover Relief.

NO

(Rebuild or Replace)
Does snow plow now
hold angle?

Crossover Relief Valve

"C"
SOLENOID

400 P .S.I.?

YES

Replace the
P.A. Block

Set C r o s s over R e lie f to

NO

380 0 +
Replace Crossover O-Rings
or complete Crossover .

NO

Replace the
P.A. Block

Pressure

400 P .S.I.

CHECK
VALVE

PILOT
CHECK

CROSSOVER
R E L IE F
3800 + 400 P.S.I

POWER AN GLING
CYLINDERS

-29-

SECTION 3 - REPAIR PROCEDURES

CONTENTS

GENERAL INFORMATION .................................................................. 31

UNIT DISASSEMBLY AND REASSEMBLY ........................................ 31

Disassembly .................................................................................... 31

Reassembly ..................................................................................... 31

• Additional Reassembly Points ................................................... 31

PUMP...................................................................................................... 31

Shaft Seal Replacement ................................................................ 31

ELECTRO LIFT

Exploded View ................................................................................ 32

Parts Breakdown ............................................................................ 33

Disassembly Photos ....................................................................... 34-41

Reassembly Photos........................................................................ 41-43

CROSSOVER RELIEF VALVE

Disassembly .................................................................................... 44-45

Reassembly ..................................................................................... 46-49

BRUSH REPLACEMENT ..................................................................... 50

Iskra Brush Replacement .............................................................. 50

American Bosch Brush Replacement.......................................... 50-51

VALVE CARTRIDGES “A”, “B” & “C” .................................................. 51

“A” Cartridge .................................................................................... 51

“B” & “C” Cartridges ...................................................................... 51

®

SPECIAL TOOLS .................................................................................. 52

SPECIFICATIONS ................................................................................

53

-30-

GENERAL INFORMATION

Using the proper guidelines and precautions, all four
model Electro Lift® units are easy to disassemble and
reassemble. Figure 3-1 (page 32) is an exploded view
which applies to all four models. It should be used as
the primary reference for proper reassembly. Where
necessary, this section includes additional information,
photographs and illustrations to assure proper and
efficient repairs.

UNIT DISASSEMBLY AND REASSEMBLY

Model E-46, E-46H, and Power Angling units with the
exception of the Power Angling Valve Assembly, the
parts and disassembly / reassembly procedures are
common to all models.

Many repair procedures, including removal and
replacement of the “B” and “C” Solenoid Valves, can
be accomplished without removing the unit from the
vehicle. While Figures 3-2 through 3-62 show the unit
clamped in a vise, make all possible repairs on the
vehicle when possible.

NOTE: Pump Assembly should not be disassembled
since it cannot be serviced with the exception of the
pressure relief valve (pages 19-20) and pump shaft seal
which is covered separately in this section.

Motor should be taken to the appropriate (American
Bosch or Prestolite) authorized service station in your
area for all parts and service with the exception of brush
replacement. Procedure for American Bosch motor
brush replacement is covered separately in this section.

Disassembly

Reassembly

See Figures 3-31 through 3-41 (pages 41-43) for
important reassembly points on any of the four models.

See Figures 3-49 through 3-62 (Pages 46-49) for
Crossover Relief reassembly.

Additional Reassembly Points

O-Rings- Coat liberally with hydraulic fluid and

position carefully to minimize possibility
of damage during assembly.

Fasteners- Torque all fasteners which are specified to

insure proper reliability and prevent
damage due to over-tightening.

PUMP

Shaft Seal Replacement

NOTE: Do not disassemble pump assembly.

1. Remove motor as shown in Figures 3-4 and 3-5
(page 34).

2. Using an appropriate tool, pry out the original shaft
seal, being careful not to damage the shaft or pump
housing.

3. Liberally coat the replacement seal I.D. with
hydraulic fluid and apply a very light film of
Permatex Form-A-Gasket No. 2 or equivalent to
the replacement seal O.D.

See Figures 3-2 through 3-11 (pages 34-36), Figures
3-25 through 3-31 (pages 39-41) for important
disassembly points on any of the four models.
See Figure 3-12 (page 36) for important disassembly
points on the E-46 and E-46H models.

See Figures 3-13 through 3-24 (pages 36-39) for
important disassembly points on the Electro Lift® units.

See Figures 3-42 through 3-48 (Pages 44-45) for
Crossover Relief disassembly.

4. Carefully slide the replacement seal
(metal side up) over the shaft until it is squarely
against the pump housing.

5. Center a 11/16" hex deep socket over the seal and
use it and a plastic or leather mallet to squarely
drive the seal into the pump.

6. Replace the motor as shown in Figures 3-39
through 3-40 (page 43).

-31-

63

56

89

57
58
59

73

65

61
62

60

81

55

80

68

69

79

64

55

71

70

72

66

67

54

53

32

44

52

75

76

77

78

86

87

88

Adjustable cross-over relief valve.

Note: Oil seepage, if any, at O-ring (86)

is normal, DO NOT attempt to stop this
seepage by further tightening of the
Acorn Nut.

85

84

83

74

ELECTRO LIFT

Exploded View

Caution:
Tor q u e t o
100-125 in.-lbs.

46

Notch on
underside

Backup

73

O Ring

O Ring
Backup

O Ring
Backup

Caution:
Tor q u e t o

75-85 in. lbs.

34

33

43

82

91

35

44

47

37

36

15

16

17

13

21

20

12

10

11

31

30

90

E-46 only

19

18

14

38

45

®

Caution:
To r q u e to
10 in.-lbs.

Caution:
Tor q u e t o
100-125 in.-lbs.

23

28

24

27

25

26

29

41

42

49

50

"A" Solenoid

Caution:

To rq ue to

100-125 in.-lbs.

22

("H" Units ONLY)

39

40

48

50b

51

49b

(A2)

(+)

9

48b

51

Caution:

Tor qu e t o

45-55 in.-lbs.

Sealant

3

(D1)

(-)

2

8

1

9

NON
ADJUSTABLE

4

7

6

Note: For Prestolite Motors extra set

of holes must be drilled and tapped.

15054

15026

15581

39

40

41

42

15043

45

38

E-46 & E47
Motor & Pump Assy.

-32-

45-55 in.-lbs.

Caution:

Sealant

Caution:
Tor q u e t o

Torque to

100-125 in.-lbs.

Locknut 5/16-24

15611

PARTS BREAKDOWN

E-46, E-47 & E-47H

E-57 & E-57H

ELECTRO-LIFT

STANDARD- LONG STROKE-

UP THROUGH HM-9 & HM-10

ITEM 1-1/8" x 6" Stroke 1-1/8" x 8" Stroke QTY. DESCRIPTION

1 15869 15869 1 Pump & Motor Assy. (12 volt)
1b 15890 15890 1 Pump & Motor Assy. (24 volt)
2a 15727 15727 1 • Motor - 12 Volt (2 Terminal)
2b 15891 15891 1 • Motor - 24 Volt (2 Terminal)
3 15889 15889 1 • Pump Assy.
4 15874 15874 1 ••Kit - Pump Relief Valve
5 15870 15870 1 •• Relief Valve Assy.
6 15878 15878 1 •• Plug w/O-Ring
7* 15875 15875 1 Seal Kit Relief Valve
8 15877 15877 1 Pump Shaft Seal
9 22339 22339 3 Soc. Head 5/16-18 x 1-3/4"
10 15045 15204 1 Cylinder Tank
11* 15131 15131 1 O-Ring 3-1/2 I.D.
12* 15163 15163 1 O-Ring 1-15/16 I.D.
13* 15198 15198 1 O-Ring 1-1/8 I.D.
14 15194 15194 1 Cover & Seal Assy.
15* 05119 05119 1 • Wiper
16* 15131 15131 1 • O-Ring 3-1/2 I.D.
17 15199 15199 1 • Sleeve

18 21805 21805 1 • Reducer Bushing 1/4 x 1/8
19 21806 21806 1 • Pressure Relief Valve
20 15207 15205 1 Cylinder
21 15209 15209 1 Washer (Grooves Down)
22 15335 15761 1 Ram Assembly
23 15208 15206 1 • Ram
24 15158 15158 1 • Piston
25 15219 15219 1 • Piston Follower
26 15760 15760 1 • Spacer
27* 15162 15162 1 • Packing Cup
28* 15125 15125 1 • O-Ring 7/16 I.D.
29 20316 20316 1 • Locknut 1/2-13
30 15573 15573 1 Base & Strainer Assy.
31 15326 15326 1 • Strainer
32 15641 15641 2 • Filter Kit - 9/16"
33 15619 15619 1 •• Filter
34 21999 21999 1 •• Plug w/O-Ring - 9/16"
35 15042 15203 3 Stud
36 15621 15621 1 Baffle
37 21980 21980 2 Retainer Ring
38 15574 15574 1 Pump Check Valve Kit
39* 15124 15124 1 • O-Ring 3/8 I.D.
40 1 • Seat
41 1 • Ball, 9/32
42 1 • Spring

C-9 ONLY

E-57 E-57H

15865 15866 1 Lift Ass'y. (Unit only) 12 volt
15881 15885 1 Lift Ass'y. (Unit only) 24 volt

08473 08473 1 Pressure Relief Valve Kit

Parts indented are included in assembly under which they are indented.

PARTS LIST

ITEM 1-1/8" x 6" Stroke 1-1/8" x 8" Stroke QTY. DESCRIPTION

43* 15122 15122 3 O-Ring 1/4 I.D.
44 21999 21999 1 Drain Plug w/O-Ring - 9/16"
45* 15127 15127 1 O-Ring 5/8 I.D.
46* 21929 21929 3 Washer, Nyltite 5/16
47 20697 20697 3 Locknut 5/16 - 24
48 15972 15972 1 "A" Solenoid Assembly
49 15905 15905 1 •• "A" Coil, Black Wire (12V)
50 15660 15660 1 •• "A" Cartridge Valve
51* 15431 15431 1 ••• Seal Kit, "A" Valve
48b 15661 15661 1 "A" Solenoid Assembly
49b 15659 15659 1 •• "A" Coil, Black Wire Plastic

50a 15660 15660 1 •• "A" Cartridge Valve
51b* 15431 15431 1 ••• Seal Kit, "A" Valve
52 15758 15758 1 • Valve Assy. w/Coup. (12V)

53 22295 22295 1 • Forged 90 Degree Elbow
54 22294 22294 1 • Coupler, Female Half
55 22293 22293 1 • Coupler, Male Half
56 15639 15639 1 • Kit-Pilot Check Valve
57 1 •• Ball, Steel
58 1 •• Spring
59 1 •• Plug
60 15609 15609 1 • Piston
61 15359 15359 1 • Plug Valve Block
62* 15126 15126 1 •• O-ring 9/16 I.D.
63 15697 15697 1 • "B" Solenoid Assembly
64 15382 15382 1 •• "B" Coil, Red Wire

65 15698 15698 1 •• "B" Cartridge Valve
66* 15432 15432 1 •• Seal Kit-"B" Cartridge
67 15576 15576 1 • Kit- "B" Check Valve
68 1 •• Ball, 7/16
69 1 •• Spring
70 15358 15358 1 • "C" Solenoid Assembly
71 15430 15430 1 •• "C" Coil, Green Wire

72 15381 15381 1 •• "C"-Cartridge Valve
73* 15433 15433 1 •• Seal Kit-"C" Cartridge
74 15606 15606 1 • Kit-Crossover Valve
* 15610 15610 1 •• Seal Kit-Crossover Valve

75 21826 21826 4 Soc. Head 5/16-18 x 1-1/2"

®

STANDARD- LONG STROKE-

UP THROUGH HM-9 & HM-10

C-9 ONLY

E-57 E-57H

15662 15662 1 •• "A" Coil, Black Wire (24V)

15779 15779 1 • Valve Assy. w/Coup. (24V)

15444 15444 1 •• "B" Coil, Red Wire (24V)

15445 15445 1 •• "C" Coil, Green Wire (24V)

(includes items A,B,D,M)

* Parts included in Master Seal Kit Part No. 15888

Basic Seal Kit Part No. 15254
Pump Relief Valve @ 2000 P.S.I. full flow. Non Adjustable
Set Crossover Relief Valve @ 3800 ± 400 P.S.I. @ 2-1/2 G.P.M.

-33-

DISASSEMBLY - ALL MODELS

FIGURE 3-2

To drain oil from the unit, remove the drain plug using a
11/16" wrench.

E-46, E-46H & E-47, E-47H

FIGURE 3-3

Drain Plug removed.

FIGURE 3-4

To replace the motor remove the two cap screws, use a
10mm hex socket on the E-57 and a 3/8" hex socket on
the E-46 and E-47.

E-46, E-46H & E-47, E-47H

FIGURE 3-5

Hold the motor parts together while removing it from the
pump.

-34-

DISASSEMBLY - ALL MODELS

E-46, E-46H & E-47, E-47H

FIGURE 3-6

To remove the pump, E-57 use a 1/4” Allen socket on
the three bolts. E-46 and E-47 use a 1/2" hex socket on
the three locknuts. The studs usually unscrew with the
nuts.

E-46, E-46H & E-47, E-47H

FIGURE 3-7

Pump removed from the unit base.

FIGURE 3-8

Remove the “A” Coil using a 3/8" or 1/2" wrench.

FIGURE 3-9

Coil removed from the “A” Cartridge.

-35-

DISASSEMBLY - ALL MODELS

FIGURE 3-10

The “A” Cartridge is removed using a 7/8" or 1-1/8" hex
deep socket.

E-46 & E-46H ONLY

FIGURE 3-11

The “A” Cartridge is removed. Clean screen by soaking
cartridge in cleaning solvent.

FIGURE 3-12

End plate is removed by using a 1/4" hex key on the four
socket head screws. Note orientation of plate to the unit,
this is critical when assembling.

FIGURE 3-13

Remove “B” and “C” Coil by using a 7/16" Wrench on
the retaining nuts.

-36-

DISASSEMBLY - E-47 and E-57 MODELS

FIGURE 3-14

Coils removed from cartridges.

FIGURE 3-15

A special hex socket, part number 21891, may be
required to remove “B” and “C” Cartridges.
(See Figure 3-67)

FIGURE 3-16

“B” & “C” Cartridge being removed from valve block.
Clean cartridges by soaking in kerosene.

FIGURE 3-17

A magnetic probe is extremely useful for removal of
small valve parts. This is the 7/16" check ball for “B”
Cartridge being removed.

-37-

DISASSEMBLY - E-47 & E-57 MODELS

FIGURE 3-18

“B” Cartridge check spring removed.

FIGURE 3-19

Use a 13/16” Hex Socket to remove pilot valve plug.

FIGURE 3-20

Pilot check piston being removed. Handle piston with
care. If piston is scratched or damaged, it must be
replaced.

FIGURE 3-21

The valve body can be removed from unit using
a 1/4" hex key or Allen Socket.

-38-

DISASSEMBLY - E-47 & E-57 MODELS

FIGURE 3-22

Use a 1/4" hex key or Allen Socket to remove pilot valve
plug.

FIGURE 3-23

Pilot check spring being removed from valve body.

FIGURE 3-24

Pilot check ball removed. This is a 3/8" diameter steel
ball.

FIGURE 3-25

There are two filters on E-47 and E-47H and one on
E-46 and E-46H units. Remove filters with an 11/16"
wrench.

-39-

DISASSEMBLY - ALL MODELS

FIGURE 3-26

Filters removed; soak in kerosene before reassembling.

FIGURE 3-27

Before removing ram and piston assembly, extend rod
fully. This drains out remaining oil in cylinder.

FIGURE 3-28

When disassembling the reservoir-cylinder assembly
use a 1/2" hex socket to remove the lock nuts. The studs
usually unscrew from the base with the nuts.

FIGURE 3-29

Cover is removed from reservoir using a large screw
driver and hammer or mallet as shown, tapping lightly
around the top cap.

-40-

FIGURE 3-30

Remove ram and cylinder assembly from reservoir then
pull ram out of cylinder. Worn packing cup on piston
should be replaced if cloth backing is visible.

REASSEMBLY - ALL MODELS

FIGURE 3-31

Remove nuts, baffle and retainer rings from studs and
screw the studs into the base. Clean reassemble Sump
Base (30) in reverse order.

NOTE: Notch on
the washer to be
on underside.

FIGURE 3-32

Clean all paint from ram then slide the cylinder over the
ram piston assembly using a rubber or leather mallet.

FIGURE 3-33

Install cylinder assembly carefully being certain it seats
squarely on “O” ring in base. Assemble O-Ring (13) and
Washer (21) as shown.

-41-

REASSEMBLY - ALL MODELS

FIGURE 3-34

Reinstall reservoir using mallet to seat reservoir
squarely.

FIGURE 3-35

Install cover assembly using mallet to seat cover, making
certain filter plug is properly located.

E-46, E-46H & E-47, E-47H

FIGURE 3-36

Drain plug and filters to be torqued to 75-85 in. lbs. with
an 11/16" hex socket. Remove nuts from pump studs
and screw into base.

FIGURE 3-37

Torque the bolts to 100-125 in. lbs. using a 1/4” hex key
or Allen Socket.

-42-

REASSEMBLY - ALL MODELS

E-46, E-46H & E-47, E-47H

E-46, E-46H & E-47, E-47H

FIGURE 3-38

Use a flat tool to hold the pump check valve in place and
assemble pump. Torque the pump to 100-125 in. lbs.
On the E-57 use a 1/4” Allen socket on the bolts and on
the E-46 and E-47 use a 1/2" hex socket on the locknuts.

E-46, E-46H & E-47, E-47H

FIGURE 3-39

To reinstall motor, align pump shaft quill and motor shaft
with appropriate bolt holes. Use a 10mm hex socket on
the E-57 and a 3/8" hex socket on the E-46 and E-47.

REFILL UNIT WITH MEYER M-1

HYDRAULIC FLUID

FIGURE 3-40

Torque cap screws to 45 - 55 in. lbs. using a 3/8” (E-47)
or 10mm (E-57) hex socket, then apply Permatex
Form-A-Gasket No. 2 or equivalent sealant around
each cap screw head.

FIGURE 3-41

Follow instructions under

“Replacement of Hydraulic Fluid”

See POST SEASON MAINTENANCE on page 3

-43-

CROSSOVER RELIEF VALVE DISASSEMBLY

FIGURE 3-42

Remove Acorn Nut (61), O-ring (60) using a 15/16” open
end wrench.

FIGURE 3-43

Remove Plug (58) and adjusting Screw (59) using a
3/8” open end wrench.

FIGURE 3-44

Remove Plug (58), Adjusting Screw (59) and Disc (57).

FIGURE 3-45

Remove Pressure Spring (55)

-44-

CROSSOVER RELIEF VALVE DISASSEMBLY

FIGURE 3-46

Remove Poppet (52), Guide (54), Washer (53),
Spacer (56).

FIGURE 3-47

Remove Cage (50), O-ring (49) using special tool.

FIGURE 3-48

Remove bottom O-ring (48) using special tool.

-45-

CROSSOVER RELIEF VALVE REASSEMBLY

FIGURE 3-49

Correct order when reassembling Crossover Relief Valve
(47). Note: All parts should be dipped in oil prior to their
assembly.

FIGURE 3-50

Reinstall O-ring (48) making certain it is seated to the
bottom of the cavity.

FIGURE 3-51

Install small O-ring (51) into top of cage (50).

FIGURE 3-52

Install small bushing (51) onto poppet (52).

-46-

CROSSOVER RELIEF VALVE REASSEMBLY

FIGURE 3-53

Assemble Poppet with bushing into Cage as shown.

FIGURE 3-54

To install Bushing (51), assemble Washer (53) onto the
Poppet as shown. Press Washer down on Cage, this
will put equal pressure on the Bushing. Hold Washer
(53) in place then remove Poppet from Cage.

FIGURE 3-55

Slide O-ring (49) over bottom of Cage. DO NOT push
O-ring completely onto shoulder of Cage. Drop Cage
assembly into block cavity.

FIGURE 3-56

Seat Cage assembly (50) to the bottom of the block cavity
using a Drift Pin of approximately the same diameter. Tap
Drift Pin lightly with a hammer until Cage assembly bottoms
out and seals against O-rings (48) and (49).

-47-

CROSSOVER RELIEF VALVE REASSEMBLY

FIGURE 3-57

Reassemble Poppet (52) into Cage.

FIGURE 3-58

Reassemble Washer (53) smooth side up.

FIGURE 3-59

Assemble Spacer (56).

FIGURE 3-60

Reassemble Spring guide (54) smooth side down.

-48-

CROSSOVER RELIEF VALVE REASSEMBLY

FIGURE 3-61

Reassemble Spring (55).

FIGURE 3-62

Reassemble Plug (58) with Adjusting Screw (59) and
disc (57).

To properly adjust the Crossover Relief Valve refer to
page 21. Push leading edge of the Moldboard against
an immovable object until Crossover Relief Valve opens.
(3800 P.S.I.
O-ring (60).

+ 400). Reassemble Acorn Nut (61) and

FIGURE 3-63

-49-

BRUSH REPLACEMENT OF AMERICAN BOSCH MOTOR

FIGURE 3-64

A special tool figure 3-69 is required to hold brushes in
motor top cap as shown.

BRUSH REPLACEMENT OF ISKRA MOTOR

FIGURE 3-65

Once top cap is positioned over armature shaft, carefully
slide tool out while pushing down on cap.

Remove motor from hydraulic unit. Remove top cap from motor housing. To replace brushes (part # 15854) start by
pushing each brush assembly towards the commutator. Remove old assembly from the insulated mounting plate,
removing retaining screws. Replace with a new brush assembly by reversing the above procedure. It is recommended
that each brush be changed in turn to avoid confusion, make sure that each brush assembly is replaced with the correct
part that has the brush cable on the the same side. Service Kits consist of 2 matching pairs of brush assemblies.

FIGURE 3-66

-50-

BRUSH REPLACEMENT

VALVE CARTRIDGES “A”, “B” and “C”

American Bosch Brush Replacement

1. The commutator end cap is removed by removing
the hex head cap screws as shown in Figure 3-4

2. While holding the motor in position on the pump,
remove the commutator end cap.

3. Remove the existing brush assemblies and brush
springs.

4. Install the replacement brush assemblies, making
certain that the leads do not contact the
commutator end cap or commutator and that the
chamfered sides of the brushes are away from the
springs. Also install the replacement springs.

5. Tighten the brush holder screws to 35-40 in. lbs.

6. Tighten the motor terminal nut to 50-60 in. lbs.,
and the lock nut to 3-5 in. lbs.

7. Apply a thin film of American Bosch LU3001
grease or equivalent to the armature shaft where
it contacts the end cap bearing.

IMPORTANT: The valve cartridges can be damaged
beyond repair by bending or denting the tube, the
portion of the cartridge surrounded by the coil.
Therefore, do not grip the cartridge tube with pliers or
clamp it in a vise.

“A” Cartridge

NOTE: Use only a 7/8" or a 1-1/8" hex deep socket to
remove and reinstall the “A” Cartridge.

The “A” Cartridge cannot be disassembled. When
operating normally, the poppet can be pushed in
approximately .030".

Jamming of the poppet due to metal chips or other
contamination can usually be eliminated by immersing
the entire cartridge in clean kerosene and pushing the
poppet in and out with a probe until it moves freely.
Dry with compressed air and reinstall.

In the event jamming cannot be eliminated, replace
the cartridge.

“B” and “C” Cartridges

8. Properly position the gasket and reinstall the
commutator end cap as shown in Figures 3-64
and 3-65.

9. Torque the cap screws and seal the cap screw
heads as shown in Figure 3-40.

Iskra Brush Replacement

See Figure 3-66

NOTE: Cartridges without a hex nut must use special
tool No. 21891 to remove and reinstall the “B” and “C”
Cartridges. See Figure 3-67

When jamming of the spool occurs, attempt to
eliminate it using the method described under “A”
Cartridge before disassembling it.

The “B” and “C” Cartridges can be disassembled by
removing the internal retaining ring. When operating
normally, the spool can be pushed in approximately
.070". However, it is generally a better use of one’s
time to replace the cartridge.

In the event jamming or some other malfunction cannot
be eliminated, replace the cartridge since individual
parts for it are not available.

-51-

SPECIAL TOOLS

FIGURE 3-67

“B” and “C” Cartridge Tool, #21891.

Crossover Relief Valve

Inner Harden Steel Wire from a Throttle/Choke cable

7.00"

0.13"

3.00"

0.75"

0.38"

1.50"

4.00"

R 0.25"

Bend Area

1.88"2.12"

6.50"

0.25" x 45 Degree
6 Places

FIGURE 3-68

2.00"

1.00"

1.06"

FIGURE 3-69

Brush holder tool for American Bosch Motor.

-52-

SPECIFICATIONS

ELECTRICAL SPECIFICATIONS

MOTOR

American Bosch M0551046A

No load (motor not attached to pump)
NOTE: Do not operate motor continuously for

more than 30 seconds.

Applied Voltage 12 Volts DC
Max. Current Draw 24 Amperes
Speed (Min.) 5900 RPM

Under load (pump operating in relief)
NOTE: Do not operate motor continuously for

more than 5 seconds.

Applied Voltage 12 Volts DC
Max. Current Draw 230 Amperes

ISKRA AMJ4739 12V.

No load (motor not attached to pump)
NOTE: Do not operate motor continuously for

more than 30 seconds.
Applied Voltage 12 Volts DC
Max. Current Draw 150 Amperes

Speed (Min.) 3,200 RPM

Under load (pump operating in relief)
NOTE: Do not operate motor continuously for

more than 5 seconds.

Applied Voltage 12 Volts DC
Max. Current Draw 230 Amperes

SOLENOID VALVES “A”, “B” AND “C”

“A” Coil

Applied Voltage 12 Volts DC
Current Draw 1.2 Amperes

Nominal resistance (ohm meter lead connected
to coil lead, other meter lead connected to metal
coil cover) 9.6 ohms ± 10% Plastic cover Coil

10.0 ohms ± 10%

”B” and “C” Coils

Applied Voltage 12 Volts DC
Current Draw 1.24 Amperes

Nominal resistance (ohm meter lead connected
to coil lead, other meter lead connected to metal
coil cover) 3.73 ohms + 3%.

SOLENOID SWITCH

Applied Voltage 12 Volts DC

Max. Current Draw 5 Amperes
Nominal resistance (ohm meter lead connected to coil
lead, other meter lead connected to metal foot)

2.65 to 4.5 ohms.

HYDRAULIC SPECIFICATIONS
PUMP - Pressure Output

E-46, E-47 (Relief Valve setting) 1650 + 50 P.S. I.
E-57 Non Adjustable 2000 P.S.I.

CROSSOVER RELIEF VALVE

Opening Pressure 3800 + 400 P.S.I.

HYDRAULIC FLUID CAPACITY

NOTE :1 Quart = 32 Fluid Ounces

Model E-46 27 oz.

Model E-46H 1 qt., 3.5 oz.

(35.5 oz.)

Model E-47 & E-57

Unit 28 oz.

Hoses & 1-1/2 x 10 Cylinders 16 oz.

Total 1 qt., 12 oz.

(44 oz.)

Model E-47 & E-57

Unit 28 oz.

Hoses & 1-1/2 x 12 Cylinders 19 oz.

Total 1 qt., 15 oz.

(47 oz.)

Model E-47H & E-57H

Unit 1 qt., 4.5 oz.

(36.5 oz.)
Hoses & 2 x 12 Cylinders 28 oz.
Total 2 qt., .5 oz.

(64.5 oz.)

Model E-57H (MDII)

Unit 1 qt., 4.5 oz.

(36.5 oz.)
Hoses & 1-1/2 x 10 Cylinders 16 oz.
Total 1 qt., 20.5 oz.

(52.5 oz.)

TORQUE SPECIFICATIONS

Thread Torque

Size (In. Lbs.)

Reservoir Cover

Retaining Nuts 5/16-24 100-125

Pump Assembly

Retaining Nuts/Cap Screws 5/16-24 100-125

End Plate or Valve Block

Retaining Cap Screws 5/16-18 96-120

Motor to Pump Retaining

Cap Screws 1/4-20 45-55

Drain and Filter Plugs 1/2-20 75-85

-53

EQUIPMENT

ELECTRO LIFT

power units

service manual

MODELS
E-46, E-46H
E-47, E-47H

®

E-57, E-57H

18513 Euclid Ave. • Cleveland, OH 44112-1084

Meyer Products Inc.

Phone [phone]

email•[e-mail]

© 2004 Printed in the U.S.A.

6 Angell Lane• Damariscotta, ME 04543-9720

Diamond Equipment

Phone [phone]

www.diamondplow.com • email [e-mail]