109 50 Hydraulic Steering Units

109 series hydraulic steering unit is an integrated orbital steering unit with 4/5 tooth tructure.This kind of steering unit has a small and exquisite structure with integrated check valve, relief valve and shock valves and its mounting dimension conforms to international standard.This kind of steering unit is widely used in mini vehicles, such as mini forklift, mini tractor (and other agricultural machinery), mini earthmoving machinery,mini municipal vehicle, etc. It can obtain more steering output torque through input of less power, with features of easy, flexible and
reliable operation.

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109 Series Hydraulic Steering Control Units (SCU)

Parameters	Type 109-1---*
Displacement(mL/r)	20	32	40	50	63	80
Rated flow(L/min)	3~20
Rated Pressure(MPa)	12.5
Relief Valve Pressure Settings(MPa)	06,07,08,09,10
Shock Valves Pressure Settings(MPa)	12,13,14,15,16
Steering Torque(N·m)	≤1.8
Max．Cont．Preesure in Line T-PT(MPa)	1
Dimension L(mm)	87	92	96	100	105	113

The installation and use of full hydraulic steering note

1 installation precautions:

(1) When installation steering gear must ensure coaxiality with column, must have a gap of 1 mm in the axial direction.
(2) The depth of screw connection to the steering column tightening steering column is ≤15mm.
(3) After steering gear installed, must check steering wheel turns to ensure the flexibility of the return position.
(4) Connection pipeline: P oil port connects to the oil supply pump, T oil port connects to the oil tank, and A and B oil ports respectively connect the left and right oil chambers of the steering gear.

2 oil flow rate considerations:

(1) The oil supply circuit connected to the P oil port, the oil flow rate in the pipe is recommended to be ≤1.5m/s.
(2) The pressure circuit of the oil cylinder connected to the A and B ports is recommended. The oil flow rate in the pipe is recommended to be ≤4~5m/s.

3 other matters needing attention:

(1) The diameter of the steering wheel must not exceed 500mm.
(2) A return filter with a filter accuracy of 30 μm should be installed in the return line of the steering gear. The position of tank is generally higher than installation position of steering gear, and return pipe is inserted below oil level, so oil can be filled only when the manpower is turned, and air can be prevented from entering the oil line.
(3) The oil viscosity of steering gear is 17cst~33cst. It is recommended to use low-condensation hydraulic oil. Steering gear allows normal working oil temperature 20°C to 80°C, and the limit working oil temperature range is -30°C to 100°C. Reminder: In case of abnormal oil temperature, steering performance will decrease.
(4) After steering system assembled, it shall be tested: clean oil tank before operation, inject hydraulic oil to the max oil level.Loosen cylinder nipple and allow pump to run at low speed until it is out of oil. Remove link,turn the steering wheel so that the piston reaches left or right position, and then fill the tank to specified level. Tighten all thread connections, connect the piston rod, and check if the steering system is working properly.
(5) It must be ensured that the oil is clean to prevent the dirt to cause steering failure. Always check the condition of the filter element and the oil. If necessary, give a replacement.
(6) If steering failure, must be carefully check the reason first. The steering wheel must not be pulled hard, and the steering gear should not be disassembled to avoid damage to parts. It is forbidden for two people to turn the steering wheel at the same time.

Troubleshooting of Metering Pump

Matter	Causes	Troubleshooting
Oil leakage between back cover, stator and valves	rear cover stator bolt looseness (or uneven force), or O-rings damaged	Evenly tighten the bolt to the specified value, replace the seal (special)
Oil leakage at steering shaft	shaft seal ring excessive wear or damage	Replace the seal (dedicated)
feels light when turn the steering wheel slowly, feelsheavy when turn the steering wheel quickly	steering pump oil supply not enough	Check whether oil pump is working properly,(Including liquid level,pump efficiency, pipeline patency, etc.)
There is foam in the oil,irregular sound, the steeringwheel turns and the cylinder does not move	There is air in the steering system	Eliminating the air in the system, Check the suction pipe leaks or not, Orif the return nozzle is below the liquid level
Heavy steering continues to occur	Tank fluid is below the specified position	Add oil to prescribed height
Heavy steering continues to occur	Heavy oil viscosity	Use oil as required
Feel heavy when turn fast and slow, stressless	Check valve between P,T failure	Check the ball. lf the steel ball is missing, then insert the steel ball; lfthe ball gets stuck dirty,it should be cleaned; In both cases,it isnecessary to check the effectiveness of the sealing tape recovery.
Turns light when the load is light,turns heavier whenincreas the load	relief valve pressure lower than steering requirement	Adjust relief valve pressure to specified value (no more than 16MPa)
	Relief valve stucked by dirt, Or spring failure,Or seal is damaged	Clean relief valve (required to check the effectiveness of seal taperecovery), or replace the spring or seal
steering wheel can't auto back to middle position	Spring broken or deformation	Replacement spring
Steering wheel rotate automatic swing to left or right	Rotor and linkage axes are not positioned correctly	Stop immediately! Align the teeth of the linkage shaft with rotor splines
No end point	Low pressure on relief valve	Appropriately increase relief valve pressure
Steering wheel rotates after turning to the end position	Low pressure on shock valves	Appropriately increase shock valves pressure
when machine is off, turn the wheel, cylinder not move	radial clearance or axial clearance is too large between radial and stator	Replace rotor and stator
when machine is off, turn the wheel, cylinder not move	Low viscosity of oil	Change oil
Vehicle deviation Or the cylinder is slow when turningthe steering wheel	shock valves failure (ball caught by dirty, or spring failure, or seal damage)	Clean shock valves,replace spring or seal
pressure of Steering system is able to adjust	Spring broken	Change spring
	not good seals at safety valve make the valve always open	replace parts
	Valve core stuck due to burr or oil stain	Remove, inspect, repair
	Poor spool operation	Check if the spool is stuck by dirty
	Spring bent or too soft	Change spring
	Oil is not clean, valve plug orifice is blocked	Replace the cleaning fluid and unblock the orifice

1. Dust seal ring	14. Spacer	30. Complete relief valve
2. Housing, spool and sleeve. Check valve and the seats for relief and shock valves are locktited.	15. O-ring	32. Complete shock valve
3. Ball 8.5 mm [0.33 in]	16. Distributor plate	33. Ball 3/16 in
4. Thread bushing	17. Gearwheel set	34. Rolled pin
5. O-ring used with kin-ring (item 6)	18. O-ring	35. Ball
6. Kin-ring	19. End cover	36. Bushing
7. Bearing assembly	20. Washer	38. Spring
10. Ring	22. Special screw	39. Kin ring
11. Cross pin	23. Screw	40. O-ring
12. Set of springs	24. Name plate

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