SANY SRT95C Off-Highway Truck. Service Manual

Transmission Oil Filter Assembly

Fig.1 Transmission Oil Filter Assembly

1. 'O' ring

7. Filter assembly

2. Elbow

8. Adaptor

3. 'O' ring

9. Hose assembly 2

4. Hose assembly 1

10. Connector

5. Bolt

11. Adaptor

6. Washer

12. Adaptor

28 TRANSMISSION OIL FILTER ASSEMBLY

Overview

Numbers in parentheses refer to Fig.2.

The transmission oil filter assembly is installed

on the frame to remove dirt, metals and other
contaminants from the transmission oil to
reduce wear and provide maximum service life
for the transmission.
A bypass valve in filter head (1) ensures an
adequate flow of oil to the transmission if
element (2) becomes clogged and cannot pass
oil through quickly enough to satisfy demand.
Pressure switch (4, Fig.2) is located in the
main filter assembly valve block. When the
filter is blocked to a certain degree, Installed
in filter head (1) is pressure switch (4) which
sends a signal to a filter restriction indicator
warning light (mounted on the dash panel) to
warn the operator when element (2) becomes
sufficiently clogged to restrict oil flow. This
indicates that element (2) should be changed.

Oil flows from the transmission to the inlet side

of filter head (1) where the oil will then take
one of two paths:
a. If the oil is cold and thick, or element (2) is
clogged, oil pressure increases and opens the
bypass valve allowing the oil to bypass the

filter and flow through filter head (1) and exit at

the outlet port to the transmission.
b. If the oil is not thick and element (2) is
not clogged, oil will flow through element (2)
before returning to the transmission.

Removal

Numbers in parentheses refer to Fig.1, unless

otherwise specified.

WARNING

To prevent personal injury and property

damage, be sure wheel blocks are properly

secured and of adequate capacity to do the

job safely.

Fig.2 Main filter assembly

1. Filter head

4. Pressure switch

2. Element

5. Housing

3. 'O' ring

Transmission Oil Filter Assembly

1. Position the vehicle in a level work area,
raise the body and secure in place with the
body safety pins. Apply the parking brake and
switch off the engine. Turn steering wheel
in  both  directions  several  times  to  relieve
pressure in the steering system.
2.  Operate  the  treadle  valve  continuously
to discharge the brake accumulators. Block
all road wheels. Set the battery in the ' off '
position.
3. Tag filter hose assembly 1 (4) and  hose
assembly  2  (9)  to  aid  in  installation  and
disconnect from adaptor (8) and elbow (2) in

filter assembly (10). remove 'O' ring (3) . Cap
open line ends and fittings to prevent entry of

dirt.
4. Support filter assembly (7) and remove

bolts (5) and washers (6). Then remove filter

assembly (7) and drain oil from assembly into
a suitable container.
5.  If  filter  assembly  (7)  is  being  replaced,
remove  adaptors (8) and elbow (2) . If filter
element  (2,  Fig.2)  is  only  being  replaced,
disassemble filter assembly (7) and replace
element  (2,  Fig.2)  as  described  under

changing filter element.
6. If required, remove filter hose assembly 1

(4) and hose assembly 2 (9) from adaptors (2)
in the transmission. Cap open line ends and

fittings to prevent entry of dirt.

Installation

Numbers in parentheses refer to Fig.1, unless

otherwise specified.

1. If new filter assembly (7) is being fitted,

install adaptors (8) and elbow (2) in filter head

(1, Fig.2).
2. Position filter assembly (7) to frame and
secure with bolts (5) and washers (6).
3. If filter hose assembly 1 (4) and hose
assembly 2 (9) were removed, remove

blanking caps, fit 'O' ring (3) and install lines

on elbow(2) in the transmission, as tagged
during removal.

Transmission Oil Filter Assembly

4. Remove blanking caps, fit 'O' ring (3) and
connect filter hose assembly 1 (4) and hose

assembly 2 (9) to adaptor (8) and elbow (2) in

filter assembly (7), as tagged during removal.

5. Set the battery in the ' on ' position. Start
the engine and check for leaks.
6. Check transmission oil level and add oil if
required.
Refer to chapter 6, ' Transmission And
Mounting ' for correct fill level and Section
36.1, ' LUBRICATION AND MAINTENANCE '

for oil specification.

7. Ensure parking brake is applied, remove the
body safety pins and lower the body. Remove
wheel blocks from all road wheels.

Changing filter element

WARNING

To prevent personal injury and property

damage, be sure wheel blocks are properly

secured and of adequate capacity to do the

job safely.

Numbers in parentheses refer to Fig.2, unless

otherwise specified.
Change filter element (2) at intervals specified

in  Section  36.1,  '  LUBRICATION  AND
MAINTENANCE '. Element (2) should also be
changed whenever a transmission overhaul is
performed, or other internal servicing is carried
out.
1. Position the vehicle in a level work area,
raise the body and secure in place with the
body safety pins. Apply the parking brake and
switch off the engine. Turn steering wheel
in  both  directions  several  times  to  relieve
pressure in the steering system.
2.  Operate  the  treadle  valve  continuously
to discharge the brake accumulators. Block
all road wheels. Set the battery in the ' off '
position.

Transmission Oil Filter Assembly

3. With a suitable container under the filter
assembly(7, fig.1) to catch draining oil,
unscrew locking collar on housing (5) and
remove housing (5) and element (2). Discard
element (2).

4. Remove and discard 'O' ring (3) from filter

head (1).
5. Clean housing (5) with clean fuel oil and dry
with a clean lint free cloth. Lubricate new 'O'

ring (3) and install on filter head (1).

6. Install new element (2) on filter head (1),
making sure plastic insert in element centre

contacts spiral snap ring on filter head (1).

7. Install housing (5) over element (2) and
secure tightly with locking collar.
8. Set the battery in the ' on ' position. Start
the engine and check for leaks. Tighten lines,

fittings and filter locking collar as required.

9. Check transmission oil level and add oil if
required. Refer to chapter 6, ' Transmission

And Mounting ' for correct fill level and Section

36.1, ' LUBRICATION AND MAINTENANCE '

for oil specification.

10. Ensure parking brake is applied, remove
the body safety pins and lower the body.
Remove wheel blocks from all road wheels.

Special tools

There are no special tools required for
procedures outlined in this section. Refer to
Section 36.3, ' SERVICE TOOLS '.

Transmission Oil Filter Assembly

Disc Brake Cooling System Pipeline And Joint

Overview

The double-gear pump II installed to the
transmission PTO supplies oil to the disc
brake cooling system.
The double-gear pump II is a composite gear
pump assembly consisting of two independent
parts. The front part includes: driving shaft and
gear, driven gear and transmission. The rear
part includes: driving gear, driven gear and
transmission. The rear part is connected to
the driving shaft and gear through connecting
shaft.

Operation

See  Fig.2  for  the  principle  of  double-gear
pump II.
When the drive gear rotates, the driven gear
rotates  in  the  reverse  direction. The  tooth
socket between the teeth of gear will bring the
hydraulic oil from the gear pump case inlet
to the outlet.  When the teeth of gears are
engaged again, the hydraulic is forced out of
the outlet. The delivery capacity of gear pump
is determined by the width of its corresponding
gear set and the rotating speed of drive gear.
The double-gear pump II pumps oil from the
the tank of hoist and disc brake system and
send it to the disc brake cooling circuit.

Fig.1 Outline drawing of double-gear pump II

Fig.2 Outline drawing of double-gear pump II

29 DISC BRAKE COOLING SYSTEM PIPELINE AND JOINT

Brake Oil Cooler And Installation

Fig.1 Disc brake oil cooler

1. Disc brake oil cooler

13. Nut

2. Washer

14. Gasket

3. Bolt

15. Washer

4. Sleeve

16. Bolt

5. Clamp

17. Bolt

6. Coolant outlet pipe

18. Washer

7. Bolt

19. Drain plug

8. Oil Inlet lines

20. Cooler flanges

9. Split flange

21. Gasket

10. 'O' Ring

22. Drain plug

11. Oil out lines

23. Heat exchanger

12. Coolant inlet pipe

30 BRAKE OIL COOLER AND INSTALLATION

OIL

OUTLET

LINES

COOLANT

INLET

PIPE

OIL INLET

LINES

COOLANT

OUTLET

PIPE

Overview and operation

Numbers and letters in parentheses refer to
Fig.1
The disc brake oil cooler is connected in the
cooling system between the transmission oil
cooler and engine oil cooler. The disc brake
oil cooler is connected in the hydraulic system
between  disc  brake  filters  and  disc  brake
assemblies, and is used to cool disc brake
cooling oil.
The disc brake oil cooler consists mainly of
heat exchanger (23) and two cooler flanges
(20),  and  is  mounted  at  the  engine  front
crossmember.
Coolant enters disc brake oil cooler (1) at
port  'B'  from  the  engine  water  pump. The
coolant  circulates  through  cooler  tubes  in
heat exchanger (23) and exits at port 'A' to
the transmission oil cooler. Disc brake cooling
oil enters through ports 'C' from disc brake oil
filters, circulates around cooler tubes in heat
exchanger (23) and exits from ports 'D' to rear
disc brakes.

Note

: Oil flow must always flow in the opposite

direction to coolant flow through the disc brake

oil cooler.

Removal

Numbers in parentheses refer to Fig.1.

WARNING

To prevent personal injury and property

damage, be sure wheel blocks and lifting

equipment are properly secured and of

adequate capacity to do the job safely.

1. Position the vehicle in a level work area,
apply the parking brake and shutdown the
engine. Turn the steering wheel in both
directions several times to relieve pressure in
the steering system.
2. Block all road wheels, set the switch of

Brake Oil Cooler And Installation

accumulator into the “off” position.

3. Remove filler cap from the hydraulic oil tank

to relieve pressure. With a suitable container
in position, remove drain plug from the bottom
of the hydraulic oil tank and drain the oil.
4.  Using  a  suitable  lifting  device,  support
engine  pan  guard  and  remove  mounting
hardware. Remove engine pan guard from
truck. Open drain cocks and drain cooling
system.  Refer  to  Section  32.1  RADIATOR
AND MOUNTING.
5.  Remove  drain  plugs  (22)  from  the  disc
brake oil cooler (1) and drain oil into a suitable
container. Remove bolt (7) and split flange
(9) securing oil inlet lines (8) to ports 'C', and
oil outlet line (11) to port ‘D’. Drain oil from oil
inlet and outlet lines (8 & 11) into a suitable
container and discard 'O' rings (10). Cap oil
inlet and outlet lines (8 & 11) and ports 'C',’D’
to prevent ingress of dirt.
6.  Remove  drain  plugs  (19)  from  cooler

flanges (20) and drain coolant into a suitable

container. Remove clamp (5) securing sleeve
(4) to ports ‘A’.
7. Support disc brake oil cooler (1) with a
suitable lifting device and remove bolts (3)
and  washers  (2)  securing  disc  brake  oil
cooler (1) to mounting bracket at engine front
crossmember.  Lower  disc  brake  oil  cooler
(1)  and  remove  to  a  clean  work  area  for
disassembly.

Cleaning and Disassembly

Numbers in parentheses refer to Fig.1

Note

: In the event of a major mechanical

failure,  transmission  oil  cooler  assembly
should be cleaned thoroughly or replaced.
Do not attempt to clean cooler cores, after a
transmission failure in which metal particles
from worn or broken parts are released into
the oil. Replace the cooler cores.
In  many  areas,  raw  water  is  extremely
corrosive  or  scale  forming  and  should
be  treated  to  prevent  damage  to  the  disc

Brake Oil Cooler And Installation

brake oil cooler (1). A properly maintained
cooling system will significantly reduce
cleaning intervals. Refer to Section 36.1,
LUBRICATION AND MAINTENANCE.

Cleaning oil side

WARNING

Dangerous fumes. To prevent personal

injury, use trichloroethylene only in the

open or in a well ventilated room.

1.  Clean  disc  brake  oil  cooler  (1)  before
sludge hardens. After disc brake oil cooler
(1) is completely drained, circulate a solution
of  trichloroethylene  through  the  passages
surrounding  the  cooler  tubes  in  heat
exchanger (23) to remove sludge.
2. If cooler tubes are badly clogged, circulate
an alkaline solution through the heat exchanger
(23). Solution should be circulated through the
heat exchanger (23), in the reverse direction

to normal flow, for approximately 15 minutes,

after soaking for 10 minutes. The duration of
circulation depends on how badly clogged the
cooler tubes are. Flush thoroughly with clean
hot water.

Cleaning water side

1. Match mark cooler flanges (20) and heat
exchanger (23) to aid in assembly.
2. Remove washers (18), bolts (17) securing
cooler flanges (20) to heat exchanger (23).
Discard gaskets (21).
3.  Make  up  a  solution  composed  of  1/3
muriatic acid and 2/3 water. To each 9.5 litres
(2.5 gal) of solution, add 225 g (0.5 lb) of
oxalic acid.
4.  Immerse  heat  exchanger  (23)  in  the
cleaning solution. Cleaning action is noticeable
by bubbling and foaming. The process must
be  carefully  observed  and  when  bubbling

Brake Oil Cooler And Installation

stops, usually between 30 - 60 sec, remove
heat exchanger (23) from cleaning solution
and flush thoroughly with clean, hot water.
After cleaning, dip disc brake oil cooler in light
oil.

Note

: Severely fouled cooler tubes can be

cleaned by use of a rotary brush if normal

cleaning is not sufficient.

Assembly

Numbers in parentheses refer to Fig.1.

Note

: Tighten all fasteners without special

torques specified to standard torques listed in

Section 36.2, TECHNICAL CONDITIONS FOR
BOLTS AND NUTS.
1. Install new gaskets (21) to cooler flanges
(20) and secure cooler flanges (20) to heat
exchanger (23) with bolts (17), washers (18).
Tighten bolts securing cooler flanges (20)
alternately to give an even seal around cooler

flange area.

2. Install drain plugs (19 & 22) in underside of
disc brake oil cooler (1).

Installation

Numbers and letters in parentheses refer to
Fig.1

Note:

Tighten all fasteners without special

torques specified to standard torques listed in

Section 36.2, TECHNICAL CONDITIONS FOR
BOLTS AND NUTS.

WARNING

To prevent personal injury and property

damage, be sure wheel chocks and lifting

equipment are properly secured and of

adequate capacity to do the job safely.

1. Using suitable lifting equipment, position
disc brake oil cooler (1) to mounting bracket
at engine front crossmember and secure with
bolts (3) and washers (2).

Brake Oil Cooler And Installation

2. Install sleeve (4) on coolant outlet pipe (6)
and secure sleeve (4) to port 'A' with clamps
(5).
3. Install new gasket (14) on coolant inlet pipe
(12) and secure coolant inlet pipe (12) to port
'B' with bolts (16) and nuts (13).
4. Install new 'O' rings (10) on oil inlet lines (8)
and oil outlet lines (11). Secure oil inlet lines (8)
to ports 'C' and oil outlet lines (11) to ports 'D'

with split flanges (9), and bolts (7).

5. Fill the hydraulic oil tank with hydraulic
oil specified in Section 36.1, LUBRICATION
AND MAINTENANCE. Refer to Section 15,
'HYDRAULIC OIL TANK ASSEMBLY' for

correct fill level. Install filler cap.

6. Ensure all drain cocks on the cooling
system are securely locked and fill cooling

system with coolant specified in Section 32.1

'RADIATOR AND MOUNTING'.
7. Using suitable lifting equipment, install
engine pan guard on the truck. Secure engine
pan guard to the truck with mounting hardware
removed during removal.
8. Start the engine and check for leaks.

Tighten lines and fittings as required.

9. Remove wheel blocks from all road wheels.

Special tools

There are no special tools required for
procedures outlined in this section. Refer to
Section 36.3, MAINTENANCE TOOLS, for
part numbers of general service tools required.

Brake Oil Cooler And Installation

Transmission Cooling Piping Mounting

Fig.1 Transmission cooling piping mounting

1.Bolt

18.Bolt

2.Washer

19.Oil outlet pipe assembly

3.Washer

20.Steel tube assembly

4.Nut

21.Fixed plate

5.' O 'ring

22.Washer

6.Flange

23.Nut

7.Washer

24.Fixed plate

8.Bolt

25.Rubber pad

9.Oil inlet pipe assembly

26.Steel tube assembly

10.Clamp

27.Bolt

11.Rubber pad

28.Lockwasher

12.Rubber pad

29.Bolt

13.Steel tube assembly

30.Hose silicone

14.Clamp

31.Oil cooler

15.Hose silicone

32.Gasket

16.Gasket

33.Water inlet tube assembly

17.Water outlet tube assembly

34.Oil outlet pipe assembly

1 2 3

6 7 8

27 28

14 30 14

8 7 6

31 TRANSMISSION COOLING PIPING MOUNTING

Overview

Numbers in parentheses refer to Fig.1.
The  transmission  oil  cooler  is  connected
between  the  radiator  and  transmission  to
maintain transmission oil within its required
operating temperature range. Coolant enters
port ' D ' from disc brake oil cooler, circulates
through cores in transmission oil cooler (31),
and exits at port ' A ' to the engine water pump.
Oil  to  be  cooled  enters  port  '  B  '  from  the
transmission convertor outlet port, circulates
around cores in transmission oil cooler (31),
and  exits  at  port  '  C  '  to  the  transmission
convertor inlet port.

Note

: Oil flow must always flow in the opposite

direction to coolant flow through transmission

oil cooler.

Removal

WARNING

To prevent personal injury and property

damage, be sure wheel blocks and lifting

equipment are properly secured and of

adequate capacity to do the job safely.

1. Position the vehicle in a level work area,
apply the parking brake and switch off the
engine.  Turn  the  steering  wheel  in  both
directions several times to relieve pressure in
the steering system.
2. Block all road wheels. Set the battery in the
' off ' position.
3. Open drain cocks and drain the cooling
system. Refer to chapter 32, ' RADIATOR AND
MOUNTING ', for procedure.
4. Remove drain plugs from oil cooler (31) and
drain transmission oil into a suitable container.
5. Remove bolts (8), washers (7) , flange(6)
and  '  O  '  ring  (5)  securing  oil  inlet  pipe
assembly (9) to ports 'B' of oil cooler (31).
6.  Drain  oil  into  a  suitable  container.  Cap

Transmission Cooling Piping Mounting

oil inlet pipe assembly (9)  and port ' B ' to
prevent ingress of dirt.
7. Remove the oil outlet pipe assembly (34)
from oil cooler (31) in same method as step 5.
Cap oil outlet pipe assembly (34)  and port ' C
' to prevent ingress of dirt.
8.  Slacken clamps (14), drain coolant into
a  suitable  container.  Remove  bolts  (18)  ,
washers (7) and gasket (32)securing water
inlet tube assembly (33) to port ' D '.  Cap
water inlet tube assembly (33) and port ' D ' to
prevent ingress of dirt.
9.  Slacken clamps (14), drain coolant into
a  suitable  container.  Remove  bolts  (18)  ,
washers (7) and gasket (16) securing water
outlet tube assembly (17) to port ' A '.  Cap
water outlet tube assembly (17)  and port ' A '
to prevent ingress of dirt.
10. Support transmission oil cooler (31) with
a suitable lifting device and remove nut (4)
,  bolts  (1,29)  and  washers  (9,10).  Lower
transmission oil cooler (31) and remove to a
clean work area.

Cleaning and inspection

Numbers in parentheses refer to Fig.1.

Note

: In the event of a major mechanical

failure, transmission oil cooler (31)  should
be  cleaned  thoroughly  or  replaced.  Do
not  attempt  to  clean  cooler  cores,  after  a
transmission failure in which metal particles
from worn or broken parts are released into
the oil. Replace the cooler cores. In many
areas,  raw  water  is  extremely  corrosive
or  scale  forming  and  should  be  treated  to
prevent damage to transmission oil cooler
(31). A properly maintained cooling system will

significantly reduce cleaning intervals. Refer to

chapter 32, ' RADIATOR AND MOUNTING ',
for procedure.

Transmission Cooling Piping Mounting

Clean oil side

WARNING

Dangerous fumes. To prevent personal

injury, use trichloroethylene only in the

open or in a well ventilated room. Avoid

direct contact with eyes or skin as irritation

can occur.

1. Clean oil cooler (31) before hardening
deposits, the oil passages in oil cooler (31)
by circulating a solution of trichloroethylene
through the passages, remove all deposits.
2.If the passages are badly clogged, circulate
an alkaline solution through the oil cooler (31).
After 10 minutes, circulate reversely for 15
minutes. Flush thoroughly with hot water.

Clean water side

1. Solution is made as follows: add 227 g (0.5
lb) of oxalic acid to each 9.5 litres (2.5 gal) of
solution composed of 1/3 muriatic acid and 2/3
water.
2. Clean the oil cooler (31) by immersing in
the solution, cleaning action is noticeable by
bubbling and foaming. The process must be
carefully observed and when bubbling stops,
usually between 30 - 60 seconds, remove
oil cooler (31) from cleaning solution and
flush thoroughly with clean, hot water. After
cleaning, dip oil cooler (31) in light oil.

Caution

: If the ordinary cleaning mode is not

effective, use the rotary brush to remove the
excessive deposits.

Assembly

Numbers in parentheses refer to Fig.1.

1. Install new gasket on oil cooler flange and
position oil cooler flange onto oil cooler (31).

Tighten the bolt.
2.Install the drain plugs onto oil cooler (31).

Transmission Cooling Piping Mounting

SANY SRT95C Off-Highway Truck. Service Manual - page 29