EATON 6, 7 HYDROSTATIC TRANSMISSION
Table of Contents – Page 1 of 1
GENERAL PARTS LIST MODEL 6 AND 7
PRODUCT IDENTIFICATION AND ORDERING INFORMATION
SPECIAL TOOLS TO AID IN DISASSEMBLY/REASSEMBLY
DISASSEMBLY/REASSEMBLY
RESERVOIR/ADAPTER—DISASSEMBLY
BODY/COVER--DISASSEMBLY
COVER--DISASSEMBLY
CAM RING--DISASSEMBLY/INSPECTION
PUMP ROTOR--REMOVAL
PINTLE ASSY.-- REMOVAL
PINTLE ASSEMBLY--DISASSEMBLY/INSPECTION
CHECK VALVE--REMOVAL
CHECK VALVE--INSTALLATION
DAMPENING PISTON--REMOVAL (MODEL 7 ONLY)
DAMPENING PISTON--INSTALLATION
MOTOR ROTOR--REMOVAL
ROTOR ASSEMBLIES--DISASSEMBLY INSPECTION
BODY--DISASSEMBLY
COVER--REASSEMBLY
CAM RING---INSTALLATION
PUMP ROTOR-INSTALLATION
PINTLE--INSTALLATION
BODY--REASSEMBLY
MOTOR ROTOR--INSTALLATION
COVER/BODY--REASSEMBLY
RESERVOIR/ADAPTER--REASSEMBLY
START-UP PROCEDURE
TROUBLE SHOOTING INSTRUCTIONS
HYDROSTATIC FLUID RECOMMENDATIONS
NO.
7-403
Eaton
r'\
Hydraulics
Division
Eaton Hydrostatic Transmissions
-
Model
6
/
7
Item
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
General Parts List
Model 6 and 7
Description
Reservoir Adapter
Reservoir Cover Subassembly
Reservoir Body
Reservoir Adapter
Seal Ring
Cover Service Kit
Dowel Pin
Retaining Ring
Washer
Button (Model 7 only)
Guide Fitting Subassembly
O-Ring
Dump Valve Bracket
Spring
Seal Ring
Pump Rotor and Ball Assembly
Pump Race
Cam Ring Assembly (includes No. 17)
Piston (Model 7 only)
Back-Up Ring (Model 7 only)
O-Ring (Model 7 only)
Pintle Subassembly
Motor Rotor and Ball Assembly
Retaining Ring
Snap Ring
Bearing
Input Shaft
Seal
O-Ring
Item
No. Description
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
Nut and Gasket Subassembly
Dump Valve Shaft
Seal
Control Shaft Kit
Dowel
Cam Ring Insert
Pin
Check Valve Body
Ball
Retaining Ring
Spring
Plug Subassembly
O-Ring
Body
Seal
Bearing
Snap Ring
Retaining Ring
Spacer
Gear
Retaining Ring
Output Shaft Subassembly
Key
Motor Race
Cap Screw
O-Ring
Plug Subassembly
Plug
This list is for identification of parts only. To insure the
correct replacement parts for your transmission, it will be
necessary to order parts by part number. Consult your
supplier for a parts list for your specific model number.
3
Contents
Product Identification and Ordering Information
Exploded View
Part
Description 3
Disassembly-Reassembly Procedures
Body Assembly-Disassembly
Reassembly
Product Identification and Ordering Information
Refer to specific listing covering your Eaton
transmission. Parts listings are available from the
Hydraulics Division, Minneapolis Plant.
4
When ordering parts, please include the following:
2
9
11
Model Number
Date Code
Part Number
Part Name
Quantity of Parts
Body/Cover-Disassembly
Reassembly
Cam
Ring-Disassembly/lnspection
Installation 11
Check Valves-Removal
Installation
Cover
Dampening Pistons-Removal
Motor Rotor Assembly-Removal
Pintle Assembly-Removal
Pump Rotor Assembly-Removal
Assembly-Disassembly/Inspection
Reassembly
Disassembly/lnspection
Installation 11
4
Installation
Installation 12
Installation 11
5
11
6
7
8
5
9
8
8
8
7
7
7
Original Build
Date Code-A10A Month
-
Model Identification
600-Model
700-Model 7
023-Specific Unit
Configuration
600-023
AlOA
cw
D12B
1
v
Factory Rebuild
Date Code-D12B1
1T2E
Month
6
Rotation
cw
ccw
Reservoir/Adapter-Disassembly
Reassembly 13
Rotor
Start/up Procedures
Trouble Shooting
Fluid Recommendations
Assemblies-Disassembly/lnspection
C
Copyright
1982
Eaton Corporation
5
8
Special
13
2
14
center.
16
2 large, wide rubber bands.
Y16-18
Light petroleum jelly (such as Vaseline).
Steel bar stock or piece of wood-2” dia.
x
tools
to aid
6
x
10 wooden block with
tap.
in
Disassembly/Reassembly
Y4”
dia. hole in the
x
2%” long.
Disassembly/Reassembly
Reservoir/Adapter-Disassembly
Fig.
1
Clean the transmission exterior thoroughly before
repairs are begun. Use a cleaning solution that
affect paint, gaskets, rubber seals, and plastic.
will
not
Eaton light duty transmissions are equipped with one
two
adapters or a reservoir as shown in Fig.
1
Remove the adapter or reservoir by rotating
clockwise.
Important: The adapters and reservoir have left
hand threads.
To
remove adapter
or socket.
To
remove adapter #2 use a six point
socket.
To
remove the reservoir use a small filter or web
wrench.
2
Remove the seal ring from the cover and discard.
Note: We recommend that all seals be replaced with
new ones whenever the transmission is disassembled
and reassembled.
To
remove turn clockwise.
#1
use a six point
2.
1½”
1/2”
hex wrench
1”
hex wrench or
Body/Cover-Disassembly
of
Important: When compressed air is used in
cleaning, do not expose lip seals or bearing
surfaces to high pressure.
Drain fluid from transmission.
Note:
A
2
x 6 x
10
wooden block with a
in the center is recommended for a suitable bench
fixture.
Adapter
Plug
I
i
#1
I
JLl
3/4
inch hole
Reservoir
8
Seal
Fig.
3
Important: Before disassembling the transmission,
scribe a line across the cover and body to ensure
will
correct reassembly. Incorrect assembly
output shaft rotation.
change
5
Fig.
2
3
Use
1/4
inch allen wrench to remove the
screws. Where applicable, remove the dump valve
shaft.
4
Lift the cover to separate from the body.
(2)
5/16
cap
Important:
pump rotor assembly to
pump ball piston assembly must remain intact
the ball pistons are matched to the pump rotor and O-ring. Discard the O-ring.
bores.
If
the cover does not separate easily from the body
because of fluid seal, tap the body and or cover with
plastic hammer to break the seal.
5 Remove the dump valve bracket, and springs,
when used.
6
Remove the seal ring and discard.
Do
not allow the cam ring, pintle, or
lift
with the cover. The
as
9
Remove the button from the cover (model
Where applicable, remove the dump valve guide, nut,
Cove
Cover-Disassembly
10
Use a sharp, narrow tool to pierce the top metal
part of the oil seal and remove seal from the cover.
Important:
distort the seal counter bore when removing seal.
Cam
Fig.
7
Do
not scratch
the
control shaft or
Ring-Disassembly/lnspection
7
only).
and Bearing
Assembly Retaining Ring
Fig.
4
7
Remove input shaft retaining ring. Press or drive the
input shaft and bearing assembly from the cover.
I
Fig.
5
6
8
Press or drive the input shaft seal from the cover.
Butt
Cover
Input Shaft
Seal
Dump Valve
Guide
Cam Ring
Assy.
Cam
Pintle
Body
Fig.
8
11
Remove the cam ring assembly from the pintle.
Remove the cam ring insert.
Important: Use special care when removing the cam
ring
from the pump rotor assembly. The ball pistons
must remain
rotor bores. Use a wide rubber band to hold the ball
pistons
12 Inspect area where the ball pistons contact the
pump race. This area must be smooth and completely
free of irregularities.
in
in
place as they are matched to the
place.
If
it is not, replace the pump race.
Pump
Race
Fig.
9
Note:
The pump race is press fit in the cam ring and
will
require a press to remove it. The cam ring and
pump race are available as an assembly.
Note:
If
irregularities are noted in the pump race, it is
reasonable to assume that one or more ball pistons and
rotor bores
will
also be damaged.
Pump Rotor-Removal
Pintle
Pintle
15
pintle assembly for cleaning. Normal flushing should
all that is required. However,
required, use the following procedures:
Note:
pintle journal.
16
area for any irregularities such as scoring or grooves
cut between ports.
Assembly-Disassembly/lnspection
Fig.
12
We do not recommend complete disassembly of the
be
if
complete disassembly is
Do
not remove the
Inspect the pintle journals, particularly in the porting
two
large plugs located on
Fig.
10
13
Hold the pintle assembly in position against the
body and remove the pump rotor assembly intact.
Pintle Assy.-Removal
Pintle
Assy.
Body
If
any irregularities are noted: Replace the pintle
assembly.
Check Valve-Removal
Note:
Removal of check valves is not necessary
check valve balls move freely and seat properly.
if
11
Fig.
14
Hold the motor rotor assembly in the bottom
position and tap lightly on the body. Lift the pintle
assembly out of the body.
Fig.
13
17
Press or drive out the coil pin that retains the
check valve bodies. Use a four blade
5/16-18
two
tap to tap
holes in check valve bodies. Insert a long bolt or a
threaded puller, pull the check valve bodies from the
pintle housing and discard them.
18
Remove check balls and retaining ring.
19
Inspect check valve balls and retaining rings.
Replace any defective parts.
Check Valve-Installation
20
Install retaining rings and check valve balls in bores
of pintle. Press new check valve bodies in bores. Press
far enough for coil pin clearance.
Dampening Piston-Installation
23
Install new back-up rings nearest to the smooth
piston face and O-rings in grove on a new piston.
24
Lubricate outer surface of the pistons. Press pistons
(smooth face up) in bores in pintle to the bottom
position.
Motor Rotor- Removal
Motor Wide
Rotor
Assy.
I
Rubber
Band
Important: To prevent dislodging
not
do
21
drive check valve bodies into bores.
Press coil pin into pintle until flush with or slightly
of
retaining rings
below surface.
Dampening Piston - Removal
(Model
Note:
Dampening
Pistons
Back-up
Rings
O-ring Seals
7
Only)
Remove only
(2)
1
(2)
(2)
if
surface is scored.
\
..
...
...
..
. . ..
...
Body
Fig.
15
25
Remove the motor assembly intact from the body.
Important: 'Use special care when removing the
motor rotor from the body. The ball pistons MUST
remain in place as they are matched to the motor
..
..
bores. Use a wide rubber band to hold the ball
pistons in place.
Body
8
Fig.
14
22
To
remove pistons, firmly tap the outside edge of
pintle on a work surface. Remove back-up ring and
O-ring from pistons.
Important: When dislodging dampening pistons, do
not hit pintle journals or the pintle housing
ruined.
Note:
If
tapping of pintle does not dislodge the pistons,
use adhesive to cement a bolt or similar object to the
pistons and pull them from the bore.
will be
Motor Contact
Race Line
16
Fig.
26
Inspect the contact line of the motor ball pistons on
the motor race located in body. This contact area must
be smooth and completely free of any irregularities.
If
any irregularities are noted, replace the motor race.
Note:
if
irregularities are noted in the motor race, it is
reasonable to assume that one or more ball pistons and
rotor bores will also be damaged.
Rotor Assemblies-Disassembly
Inspection
Motor
Rotor
Pump
Rotor
Spring
31
Remove the snap ring that retains the output shaft
and tap or press the shaft from the body.
Body
Seal
17
Fig.
27
Inspect the rotor assemblies. Remove the piston
balls from the rotor, one at a time, by working clockwise
from the letter stamped in the face of the rotor and
in
placing
Note:
from which it was removed. Use a suitable container for
piston ball storage such as an egg carton or ice cube
tray. output bearing to body. Drive or press the output
28
rotor assembly.
Note:
no other irregularities, the springs may be replaced
individually without replacing the complete motor rotor
assembly. shaft and cover exceeds
29
completely free of any irregularities.
30
journals for irregularities or excessive clearance. The
ball piston
electronically to
irregularities or excessive clearance are noted, replace
the complete rotor assembly.
a prepared container.
Each ball must be replaced in the same bore Fig.
Inspect for broken or collapsed springs in the motor
When broken or collapsed springs are found with
Inspect the piston balls. They must be smooth and
Inspect the rotor bores, rotor bushing and pintle
to
rotor bore clearance is select fit
.0002
to
.0006
of an inch. When
Bearing
Retaining
Ring
19
32
Remove the large retaining ring that retains the
bearing and seal from the motor body.
Cover-
33
Inspect cover assembly, especially around the
control shaft area. Replace the cover assembly
broken, cracked or
Reassembly
if
side clearance between control
if
'it is
.006.
34
In most cases, it
the control shaft from the cover.
broken in the control shaft, remove the shaft using the
following procedures.
Measure this Distance
will
not be necessary to remove
If
the dowel is loose
A
or
Control
Install ball pistons in their matching bores. Hold them in
place with a rubber band.
Body
Body
output
Shaft
Fig.
18
Fig.
20
35
Measure the distance between center of dowel pin
and the end of the shaft as shown in Figure
36
Turn cover over. Use this dimension to locate dowel
pin
in
cover face. Drill
point of dowel pin. Drill hole exactly in line with center
of shaft.
11/32”
diameter hole at center
20.
9
9
Fig. 21
measured
Cover
Fig. 24
40
Lubricate
I.D.
of new oil seal with clean lubricant.
Then press or tap seal in bore until completely seated.
Washer Washer
Fig. 22
37
Press loose or broken dowel pin out. Remove
retaining ring and washer from end of control shaft.
Remove control shaft outward from the cover.
Oil Seal
Cover
Fig.
25
Lip
Seal
Cover
. . . . . . . . . . . . . .
. .
. . .
. . .
Fig. 26
41
Lubricate inner surface of the lip seal with a clean
lubricant. Press or tap seal into the bottom position in
cover counter bore.
”
Pipe Plug
10
Fig.
23
38
Tap hole drilled with
type pipe plug.
39
Lubricate a new control shaft and install in cover.
Replace washer and retaining ring on end of control
shaft. Press new dowel pin through shaft leaving
inch of dowel extending from shaft.
Important: When pressing the new dowel pin into
the control shaft, the Woodruff key in control shaft
be
must
to the left looking at the threaded end of
shaft.
1/8”
pipe tap. Install
1/8”
flush
1%
Important: Be careful not to damage the inner
portion of the oil seal. Excessive pressing or
driving of the
oil
seal will damage the rubber
portion of the seal.
Retaining
Ring
27
Fig.
42
Install the input shaft assembly into bottom position
in the counter bore in cover. Install the retaining ring in
the groove located in front cover.
Pump
Rotor-Installation
Pump Rotor
Cam Ring-Installation
Cam Ring Cam Ring Insert
Fig.
28
43
Install the button in the hole located in the cover.
(In Model
44
the cam ring as shown in Figure
7
only)
Install the cam ring insert with the hole away from
28.
Rubber Band
Cover
Fig.
30
47
Align the internal spline in the pump rotor assembly
with the external spline on the input shaft and install the
pump rotor in the cover.
Remove the rubber band retaining the ball pistons (if
used).
Pintle-Installation
45
Align the cam ring with the control shaft pin and the
cam ring pivot pin.
Install the cam ring with the flush side
race facing the cover. Press in firmly until the cam ring
has bottomed in the cover assembly.
ring
Important: Cam
stop. If
ring
again.
O-ring Dump Valve O-ring Dump Valve
46
groove located in dump valve guide. Install guide
through cover and install O-Ring and nut. Lubricate
dump valve, valve shaft and install in guide assembly.
Note:
binding
insert
Where applicable, lubricate O-Ring and install in
180°.
Check dump valve shaft for freedom
movement.
must move freely from stop to
occurs at either stop rotate the cam
Check the cam
Guide
Fig.
29
of
ring
movement
\
the bearing
Shaft
of
Fig.
31
48
Install the
pintle assembly.
Use a small screwdriver to compress and hold dump
valve bracket into pintle to clear previously installed
dump valve guide located
49
Align pintle assembly with the cam ring pivot pin
and guide pintle assembly into pump rotor. Push to
bottom position
two
springs and dump valve bracket into
in
cover.
in
cover.
Note:
Do
not force pintle through the pump rotor
assembly as it is a slip fit. The pump rotor assembly
must turn freely on the pintle by hand.
pintle installation.
50
Push dump valve shaft in and thread into dump
valve bracket.
51
Lightly grease new cover sealing ring and install in
the groove in the cover.
Torque to
2-3
Foot Pounds.
If
not recheck
Body-Reassembly
Lip Seal
Body
Fig.
32
52
Lubricate inner surface of new lip seal and install
with the rubber lip
in body.
Important:
may damage the rubber sealing portion
or
distort counter bore.
53
Install output shaft into body, protecting the shaft
seal lip from keyway and snap ring grooves.
Support the output shaft from underneath body
the cross pin in output shaft is tight against body.
of
the seal toward the counter bore
Do
not over press
or
drive the
seal,
of
the seal
so
this
that
Retaining
34
Fig.
54
Install output shaft bearing by positioning bearing
over output shaft and pressing on outer race of ball
bearing to the bottom position in body.
55 Install small snap ring on output shaft against inner
bearing race.
56 Install the large retaining ring used to retain ball
bearing in body.
Note:
The output shaft must rotate freely by hand.
doesn't, recheck bearing installation.
If
it
Motor Rotor-Installation
Motor
I
Rotor Rubber
Assy. Band
Wide
Use a solid block (steel or hardwood)
diameter by at least
output shaft.
12
1%
inches long to support the
a
Fig.
33
2
inches in
Fig.
35
57
Align the slot in the motor rotor assembly with the
cross pin on the output shaft and install the motor rotor
in
body.
58
Remove the rubber band retaining the ball pistons
in their respective bores (if used).
Cover/Body-Reassembly
Fig.
36
61
Lightly grease sealing ring and install into recess
in cover.
62
Install the adapter or reservoir in cover by rotating
counterclockwise.
Torque to Approximately 8-12 ft. Ibs.
Important: The adapters and reservoir are threaded
left hand. To install, turn counterclockwise.
Start-up Procedure
Important: Be sure to realign previous scribed line
for correct ouput rotation.
installed 180° as previous assembled output
rotation
59
body on pintle.
Note:
is
a slip fit and must turn freely by hand.
60
torque to
will
be reversed.
Hold the motor rotor assembly in position and install
Do
not force motor rotor assembly on pintle as it
Install the
(2)
5/16
15
foot pounds.
x
If
body assembly
1
1/4
socket heat cap screws and
is
Reservoir/Adapter-Reassembly
I
Fig.
38
63
Remove the
transmission. See Page
Attached Reservoir
Fill the transmission with the proper fluid through
reservoir until fluid overflows from opening in body.
Rotate both the input and output shafts to purge any
trapped air from transmission. Refill reservoir until fluid
reappears and install hex head plug,
Foot Pounds.
Fill reservoir to oil level cold mark.
3/8
hex head plug to vent the
16
for fluid recommendations.
Torque to 2-5
i
13
Fig.
37
Separate Reservoir
Fill the transmission with the proper fluid through
customer supplied separate reservoir until fluid
overflows from opening in body.
Rotate both the input and output shafts to purge any
trapped air from transmission. Refill reservoir until fluid
reappears and install hex head plug.
Foot Pounds.
Fill reservoir to proper fluid level shown.
Torque to 2-5
Trouble Shooting Instructions
This fault-logic troubleshooting section is designed as a
diagnostic aid in locating transmission problems by the
user.
Match the transmission problem with the problem
statements and follow the action steps shown in the
diagrams. This will give the user expedient aids in
correcting the problem and eliminating unnecessary
machine down time.
System
I
I
Inspect
External Control
Linkage
I
Defective
I
Replace Externally
Jerky When Starting
Transmission
I
Defective
I
Serviceable
14
System Operates in One Direction Only
External
Control Linkage
Defective
Defective
Serviceable
Externally
f-'
System Operating
Transmission Check Oil
I
Below Level
I
Proper
Level
OK
Hot
Will
Below Level Defective Defective
Clogged
I
Clean
Loss
of
Power
Defective
Serviceable
Externally
or
System
Not Operate in Either Direction
OK
15
EATON
HYDROSTATIC TRANSMISSION
MODEL
6/
7
REPAIR MANUAL
NO.
7-403
Hydrostatic Fluid Recommendations
A reputable supplier can help you make the best selection of
hydraulic fluid for use in Eaton hydrostatic products.
For
apply:
1.
The filter system used in the hydraulic circuit should be
capable of cleaning and maintaining the hydraulic fluid
meet
allows a maximum of 2500 particles per milliliter greater than
5
15 µm.
2.
At normal operating temperatures, optimum viscosity ranges
are from 80-180
below
temperature, should not exceed
3.
The fluid should be chemically stable, incorporating rust and
oxidation inhibitors.
Specific types of fluid meeting these requirements are:
Note:
is possible that an overheating or water contaminant problem
exists.
For accurate level readings, take readings when the fluid is cold.
*Supplied in Model
Transaxles, and
shipped from the Spencer factory. The viscosity of this factory
fluid is equivalent to
duty transmissions, pumps, transaxles and motor axles are those
having a viscosity equivalent to
satisfactory operation, the following recommendations
ISO
Cleanliness Code 18/13 per SAE J1165. This code
µm
and a maximum of 80 particles per milliliter greater than
SUS
60
SUS
Premium hydraulic oil'
Engine crankcase oil-SAE 1 Ow, SAE
Automatic transmission oil
Hydraulic transmission oil
Synthetic fire resistant fluid-
Quintolubric 822-220,
Quaker Chemical Co.
Conshohocken, PA 19428
Cosmolubric HF-122, -130, -1 44 or -1 530
E.F.
Houghton & Co.
Valley Forge, PA
Milisafe Code 1274 (280 Series) 280-1 50, -300 or -500
Future Trend Industries
Cottage Grove,
If
the
natural color of the fluid has become black or milky, it
780
(16-39 cSt). Viscosity should never fall
(10 cSt) and, at the lowest expected start-up
MN
6
and 7 Transmissions, Model
Transaxles without charge pumps that are
SAE
2Ow-20.
10,000
SUS
(2158 cSt).
2Ow-20,
-300
or -450
55016
The preferred fluids for all light
SAE
2Ow-20,
SAE
750
30
SAE
and
or
SAE
30
770
to
.
40.
Eaton Corporation Hydraulics Division
151
51
Highway 5 Eden Prairie,
MN
55344
Telephone
(61
2)
.
REVISED
937-9800
OCTOBER,
FORM
NO.
1988
7-403-108
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