Toro 41-20OE02, 41-20OE03, 51-12KE01, 51-12KE02, 51-16OE01 Service Manual

HYDRAULIC LIFT VALVE/CYLINDER MANUAL - WHEEL HORSE

Table of Contents – Page 1 of 1

FOREWORD

CONTROL VALVE SERVICE
GENERAL INFORMATION
MANUFACTURING DATE CODE (OMCO)
VALVE DESCRIPTION (OMCO)
OVERHAUL KIT CONTENTS (OMCO)
OVERHAUL PROCEDURE (OMCO) SERVICE NOTES
DISASSEMBLY & R EA SS EM BL Y
VALVE DESCRIPTION (VICTOR)
OVERHAUL KIT CONTENTS (VICTOR) VICTOR 110068 & 111066 CONTROL
VICTOR 110492 CONTROL VALVE
OVERHAUL PROCEDURE (VICTOR) SERVICE NOTES
DISASSEMBLY & REASSEMBLY (SINGLE SPOOL VICTOR)
DISASSEMBLY (TWO SPOOL VICTOR)
ASSEMBLY (TWO SPOOL VICTOR)

LIFT CYLINDER SERVICE
GENERAL INFORMATION
CYLINDER DESCRIPTION
O-RING & GASKET KIT CONTENTS
OVERHAUL PROCEDURE SERVICE NOTES
DISASSEMBLY & R EA SS EM BL Y

HYDRAULIC

LIFT

VALVE

&

CYLINDER

REPAIR

MANUAL

Printed in U.S.A.

0984

PART

NO.

810242R3

FOREWORD

This

service and repair manual has been compiled to provide
authorized Wheel Horse service personnel with proper procedures and
techniques for servicing hydraulic
used on Wheel Horse equipment.

Following Table of Contents

to read all sections first to become familiar with repair procedures.

Since valves and cylinders are hydraulic components, strict clean­liness must be maintained during all stages of service and repair.
Even a small amount of
components. Always use clean solvent when cleaning parts.

of

tamination
clean entire system. Clean
Transmission and transaxle must be cleaned to insure all contaminants
are removed.

hydraulic system has occurred or

dirt

or contamination can severely damage

lift

lift

control valves and cylinders

lists

all areas covered.

is

suspected, be sure to

cylinder, valve, all hoses and lines.

It

is

adviseable

If

con-

CONTROL VALVE SERVICE

GENERAL INFORMATION
MANUFACTURING DATE CODE (OMCO)
VALVE DESCRIPTION (OMCO)
OVERHAUL
OVERHAUL PROCEDURE (OMCO)
VALVE DESCRIPTION (VICTOR)
OVERHAUL
OVERHAUL PROCEDURE (VICTOR)

KIT

CONTENTS (OMCO)

KIT

CONTENTS (VICTOR)

________________________________________-~----.--~~~

- - - - -

- - - - - - - - - - - - - -

1

1
1

1

2

........................................

2

3

4
4

GENERAL INFORMATION

This manual covers the overhaul of

lift control valves listed below.

&

102874

1973 18

tractors with Sundstrand hydrostatic transmission.

lift

relief valve located in the hydrostatic transmission.

103204

1973 16

tors with Sundstrand hydrostatic transmission.
system pressure
valve located in the hydrostatic transmission.

108494 (OMCO) Fig. 2

1980-82
Eaton hydrostatic transmission, except C-195. lift
system pressure
valve located to the right of the valve handle.

109679 (OMCO) Fig.

1982-83 C-195 Twin Automatic tractors.
pressure
located next to the outside valve handle.

110068

1983 & later
Eaton hydrostatic transmission, except C-195. AI-

though the valves are made by different vendors
and require different overhaul
changeable as complete assemblies. lift system
pressure

located next to the valve handle.

110492 (VICTOR) Fig. 11

1984 & later C-195 Twin Automatic tractors with

Eaton hydrostatic transmission.

is

inside valve handle.

10668 1 (OMCO) Fig. 1

HP

Automatic, 1974-80 D-Series Automatic

system pressure

&

106680 (OMCO)

HP

and 1974-80 C-Series Automatic trac-

is

is

regulated by an implement relief

-

C

&

GT-Series Automatic tractors with

is

regulated by an implement relief

2

-

is

regulated by an implement relief valve

&

11 1066 (VICTOR) Fig. 11

C

&

GT-Series Automatic tractors with

is

regulated by an implement relief valve

-

regulated by a relief valve located next to the

-

regulated by an implement

Fig.

1

-

the

-

kits,

they are inter-

lift

system pressure

hydraulic

lift

system

lift

set at 700
Severe transmission damage may result. Refer to the,
applicable repair manual for system pressure tests
and adjustments.

When the valve handle
valve inward, hydraulic port "A"
port
the spool valve

is

pressurized and port "A"
port. The spool valve
middle, "neutral" position, where ports "A" and

are sealed off from both the pressure and outlet ports.

These

to flow from the pressure port to the outlet port when
the spool
plished mechanically by the tractor's

MANUFACTURING

102874

PSI

-

do not attempt to alter this setting.

is

moved to push the spool

is

pressurized and

"B"

is

connected to the outlet port (Fig. 3). When

is

pulled outward, hydraulic port

is

connected to the outlet

is

spring loaded to return to

are open-center valves,

is

in neutral. Attachment "float"

so

hydraulic oil

lift

DATE

CODE

I03204

&

&

106681

VALVE

FIG

1.

OMCO

(Sundstrand Transmission)

MANUFACTURING

Control Valves

DATE

CODE

linkage.

I

06680

is

VALVE

"B"

"B"

is

free

accom-

a

MANUFACTURING DATE CODE (OMCO)

The month and year a particular hydraulic valve
was manufactured
outlet cover as shown in Figures 1
lines of information may be on the cover, which are
decoded as follows:

Example (on all valves): 0948 1 9
Example (on some valves): SR115 4
Manufacturer's Control numbers

Month Built

(1

=

January; 12

Year Built

(9

=

1979;

is

stamped on the flat side of the

&

2. One or two

=

December)

0

=

1980; 1 = 1981, etc)

0

VALVE DESCRIPTION (OMCO)

The hydraulic control valves are made up of one
or two
inlet and outlet cover. Normal working pressure
500-700
can be field adjusted. On Eaton systems the implement
relief valve

spool

valves and bodies, secured between an

PSI.

Sundstrand implement system pressure

is

part of the control valve and

is

factory

is

-1-

108494

VALVE

FIG.

FIG.

3.

109679

IMPLEMENT

2.

OMCO

(Eaton Transmission)

PRESSURE

FROM

TRANS.

OUTLET

TO

OMCO

Valve

VALVE

RELIEF

VALVE

Control Valves

INLET

TRANS.

Port

Identification