Sunward hidraulic

1. Hydraulic system

2. Ⅰ, Combination Pumps AA10VG + AA10VG
Combination pumps make it possible to
have independent circuits without the
need to fit splitter gearboxes.
For combination pumps consisting of
more than two pumps, the mounting
flange must be rated for the permissible
mass torque.

3. Ⅰ, Variable displacement piston pump

4. Ⅰ, Specification of pump
AA20V G 45 DG M 2 / 10 R - N T C 66 F
01 02 03 04 05 06 07 08 09 12 13
01 Axial piston unit:Variable swashplate design, nominal pressure 4350 psi (300
bar), peak pressure 5100 psi (350 bar)
02 Operation mode :Pump in closed circuit
03 Displacement :45 cm3/rev.
04 Hydraulic control :direct operated
05 Mechanical stroke limiter : With spring centering of neutral position
06 DA control valve :With DA control valve, fixed setting
07 Direction of rotation :Viewed from shaft end
08 Seals :NBR (nitrile-caoutchouc), shaft seal ring in FKM (fluor-caoutchouc)
09 Shaft end :for combination pump
10 Boost pump :with through drive

5. DA - Hydraulic Control, Speed Related
The DA control is an engine
speed-dependent, or automotive,
type control system. The built-in
DA regulating cartridge generates
a pilot pressure that is
proportional to pump (engine)
drive speed. This pilot pressure is
directed to the positioning cylinder
of the pump by a solenoid
actuated 4/3 way directional valve.
Pump displacement is infinitely
variable in each direction of flow,
and is influenced by both pump
drive speed and discharge
pressure.

6. Main pump illustration one

7. Why DA control speed related?
When the skid steer loader or
multi terrain loader enters the
pile, the wheels use more
power; then, as the operator
starts to lift, the hydraulics
take most of the engine's
power to break the bucket out
of the pile.
To avoid this, the machines
automatically reduce the
displacement of the pumps.
This keeps the engine from
stalling while still maintaining
torque to the wheels or tracks
at a reduced speed.

8. Main pump illustration two

9. Pipeline connection of main pump(Ⅰ)

10. Pipeline connection of main pump(Ⅱ)

11. Adjust the zero displacement of variable cylinder
If the machine
travels while
hand lever is on
neutral position,
or if it travels in
deviation when
operating hand
lever, check
whether the
variable
cylinder is right
on “zero”
position. If not,
adjust it by
centering screw
rod.

12. Adjust the zero displacement of variable cylinder

13. Adjust max displacement of variable cylinder
When leaving factory, the
oil pump’s displacement
is set at 46ml/r (the max.
one). If machine travels
in deviation when hand
lever is on the position of
max.operation range, the
output volume of two oil
pumps is likely to be
different, which can be
adjusted by max.
displacement limitation
screw.

14. Travel motor-radial piston motor

15. Structure of motor
Hydraulic motors type MCR are radial piston motors with a rotating shaft. The rotor (4) is
connected to the shaft (6) by means of splines. The pistons (3) are arranged radially in
the rotor (4) and are supported on the cam plate (5) by way of rollers (8).

16. Technical data of the motor
Description Radial piston with fixed displacement
Type mounting Flange mounting; face mounting
Displacement 400 ml /r
Normal flow: 400 ml /r
Output torque 636 Nm
Max. speed 2600rpm
Nominal pressure 250 bar
Brake hydraulic release holding brake

17. Travel motor port

18. Instruction of main control valve
Simple, compact and heavy duty
designed 3 sections monoblock
valves for open center hydraulic
systems.:
1,Fitted with a main pressure relief
valve.
2,Each spool has indipendent load
check valve.
3,A wide variety of service port
valves.
4,Diameter 18 mm --0.71 in
interchangeable spools.

19. Dimension of the valve

20. Draft of control valve(one)
The main overflow valve① of
manifold valve determines
system’s working pressure.
The working pressure for this
system is set at 210±10BAR,
while the pressure for second
overflow valves ②③ is set at
235±10bar. When manifold
valve is used in large flow
system, take away the plug ④,
install a transition connector to
channel hydraulic oil to large
flow control block.

21. Draft of control valve(two)

22. Internal component of control valve

23. Working pressure testing
Relief valve,which can
adjust the working
pressure
Testing port,the
working pressure
should be about
210bar.

24. Introduction of pilot oil block(one)
B
A
C
D
• A :working equipments
• B : Pilot flow
• C : brake
• D : Pressure switch

25. Illustration of piloy oil block(two)

26. Illustration of piloy oil block(three)

27. Hydraulic oil flow of pilot oil block
PH
PV

28. Pipeline connection of pilot oil
PS
PG

29. DA control valve pressure control
Testing port,which can
test the pressure of
DA control valve.The
testing range of this
should be between
6bar and 18 bar,from
the lowest engine
speed to the max.

30. Instruction of high flow control block
Place a manometer
whose measurement
range is 60MPa in
connector for
pressure test. The
pressure for this
device can be set by
adjusting safety
valve. The pressure
is set at 210bar
when leaving factory.

31. Instruction of auto-leveling valve

32. Draft of auto-leveling valve working

33. Draft of auto-leveling valve

34. Outside view of working joystick

35. Hydraulic circuit of working joystick

36. Curve diagram of working joystick

37. Outside view of travel joystick

38. Hydraulic circuit of travel joystick

39. Curve diagram of travel joystick

40. Outside view of gear pump

42. Thanks for listening!