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Service
8352 W 5/00 e
Function
Maintenance
Inspection
Troubleshooting
ZF Servocom® RAS(Rear Axle Steering)
ZF Lenksysteme GmbH
D-73522 Schwaebisch Gmuend
Telephone (07171) 31-0 Fax (07171) 31-4396
Contents / System description / Notes
1ZF-Servocom RAS
Contents:Page
1 Functional description 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Safety instructions 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Maintenance 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Inspection 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Disassembly of the ZF-Servocom RAS 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Installation of the ZF-Servocom RAS 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Charging with gas 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 Filling with oil 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 Bleeding 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 Settings and tightening torques 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11 Special tools 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12 Troubleshooting 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System description:
! The ZF-Servocom RAS is a rear axle steering system which hydrostatically transmits the steeringmovement of the front axle to the rear axle (as in the case of a hydraulic braking system).
! The hydrostatic power is transmitted from the master cylinder (front axle) via hydraulic connectionsto the centering cylinder (rear axle).
Notes:! This manual is exclusively intended to supplement the existing instructions for operation, maintenance
and inspection of the ZF-Servocom steering systems.
! All the work described here should be carried out within the framework of routine maintenance andinspection of the ZF-Servocom.
! All the settings and test values or dimensions listed are standard values which apply for all versions.
Exception: The individual vehicle manufacturers may prescribe different values. Please take noteof the service information circulars and the spare parts list!
Function
ZF-Servocom RAS2
1 Functional description
1.1 Mechanical design
1 ZF-Servocom 3 Centering cylinder2 Master cylinder with 4 Hydraulic accumulator
pressure limiting valve 5 Hydraulic linesand replenishing vavle 6 Pressure switch
7 Connecting rod
1.2 Function
! The steering movement is transmitted from the ZF-Servocom or front axle steering (1) mechanicallyvia a connecting rod (7) and hydraulically via hydraulic lines (5) to the master cylinder (2) which ismounted on the front axle or vehicle chassis.
The master cylinder (2) hydrostatically transmits the steering movement via hydraulic lines (5) to thecentering cylinder (3) on the trailing axle. This axle is steered by the centering cylinder via the pistonrod.
The hydraulic accumulator (4) improves the rigidity of the hydrostatic transmission system and actspermanently on the two centering pistons which are integrated into the centering cylinder (3).
Pressure limiting valves are installed in the master cylinder (2) in order to protect the hydrostaticsystem against impermissibly high pressures which could damage the system.
The master cylinder (2) also includes replenishing valves to prevent the formation of a vacuum inthe unpressurized cylinder area and thus facilitate the steering movement.
The pressure switch (6) monitors the system pressure and is connected to a pilot lamp.
Additional information for versions with cut-off valve (8):
The cut-off valve (8) (see figure on page 18) connects the lines L1 and L2 in case of breakdown of thehydraulic assistance of the front axle steering gear.
This produces the fact that the ZF-Servocom RAS does not co-steer and that no additional actuatingforces are required at the front axle steering gear.
Function
Operating pressure - front axle steering
System pressure
Accumulator pressure (gas-charged)
3ZF-Servocom RAS
1.3 Function when travelling straight ahead
! The master cylinder (2) is designed so that the cylinder areas Z1 and Z2 are connected when travel-ling straight ahead and when the steering angle is less than 5o. This ensures that the four cylinderareas Z3, Z4, Z5 and Z6 in the centering cylinder (3) are pressurized by the hydraulic accumulator(4), thus holding the trailing axle in position for travel straight ahead.
Short-circuiting cylinder areas Z1 and Z2 and centering the trailing axle additionally ensures that themaster cylinder and centering cylinder (3) are synchronized. This compensates any hydrostatic off-sets which may occur, for example as a result of minute leaks.
Function
Operating pressure - front axle steering / return flow
Operating pressure - front axle steering
System pressure / return flow
System pressure
Accumulator pressure (gas-charged)
ZF-Servocom RAS4
1.4 Function when steering to the right
! Cylinder space Z7 in the master cylinder (2) is pressurized by the ZF-Servocom or front axle steering(1) and displaces the piston rod to the right.
This pressurizes the hydraulic fluid in cylinder space Z1, as well as in cylinder space Z6 via hydrauliclines (5) if the steering angle is greater than 5o.
The piston rod of the centering cylinder (3) is consequently displaced to the left and the trailing axleis steered to the left.
Safety instructions / Maintenance
5ZF-Servocom RAS
2 Safety instructions
Attention:
! Lines and connections, etc. must not be opened until the system pressure of the ZF-Servocom RAShas been relieved.
The bleeder valves must be opened slowly to bleed the system.
Note that at least the system pressure is still present in the hydrostatic system even when the enginehas been switched off.
! The front axle steering must not be actuated when connections or lines, etc. on the rear axlesteering system have been opened, since the high resultant pressures may cause injuries.
3 Maintenance
3.1 Maintenance intervals
The maintenance intervals which apply for the ZF-Servocom steering system or which are specifiedby the vehicle manufacturer also apply for the ZF-Servocom RAS.
Note any other or additional intervals specified by the vehicle manufacturer.
3.2 Maintenance work
Check oil level
ZF-Servocom RAS:
The oil level cannot be checked. This is also unnecessary, since oil cannot be lost during normaloperation and when the ZF-Servocom RAS is in good condition.
ZF-Servocom (front axle steering):
Check oil level in oil tank.If the oil level exceeds the maximum permitted, this may be due to a leak in the master cylinder.
Check for external leaks
Hydraulic lines, connections, master cylinder, centering cylinder and hydraulic accumulator mustbe visually inspected for leaks.
There must not be any visible leakage. Only the piston rods of the master and centering cylindersmay be coated with a film of oil. The formation of drops is not permissible.
Check bellows
Check that the bellows is seated correctly and undamaged.
The bellows must not be twisted.
Inspection
Bleeder valve
Connection
Spindle A
Valve B
Tool [1]
ZF-Servocom RAS6
4 Inspection
4.1 Inspection intervals
! The same inspection intervals apply for the ZF-Servocom RAS as for the ZF-Servocom steering.
Note any other or additional intervals specified by the vehicle manufacturer.
4.2 Inspection work
4.2.1 Carry out the maintenance work described in section 3.2.
4.2.2 Check system pressure on hydraulic accumulator
Remove cap on hydraulic accumulator.
Slightly loosen the hexagon socket head screw of connection A2 (back off approx. one-quarterturn anticlockwise).
Screw tool [1] onto connection A2 by hand with the union nut.
Turn pressure gauge so that it can be read off conveniently.
Close valve B.
Turn spindle A of tool [1] to the left until the pointer on the pressure gauge begins to move. Thengive it one more full turn.
Inspection
Valve
Tool [2]
7ZF-Servocom RAS
! Read off the system pressure. Required: 15 +1/-3 bar (see note on page 1).
Note:If the system pressure corresponds with the required value, the accumulator pressure need not bechecked as described in section 4.2.3 since it will invariably be correct in such cases.
Tighten the hexagon socket head screw with spindle A in order to close the valve.
Unscrew the union nut and remove tool [1].
Tighten the hexagon socket head screw with a torque of 25 Nm and leak-test the valve withsealing spray or soapy water.
Refit the cap.
4.2.3 Check hydraulic accumulator pressure
Connect tool [2] to connection A1.
Turn the valve anticlockwise with tool [2] to relieve the system pressure. At the same time, checkwhether the pilot indicator installed in the cab switches at a remaining pressure of 2...5 bar.
Connect tool [1] to connection A2 as described in section 4.2.2.
Read off the accumulator pressure. Required: 10 +1/-3 bar (see note on page 1).
Note:If the accumulator pressure does not correspond to the required value, the accumulator pressuremust be increased as described in section 7 or the hydraulic accumulator replaced.
Close the valve of tool [2] by turning clockwise.
Check whether the oil tank of tool [2] has been filled (oil grade see section 6.1).
Build up the system pressure with tool [2] by actuating the hand pump. Required: 15 +1/-3 bar(see note on page 1).
Remove tool [1] as described in section 4.2.2.
Close the valve of the hydraulic accumulator as described in section 4.2.2.
Remove tool [2].
4.2.4 Check cut-off valve (8) and switch relay (9)
Connect cable plug of the signal sensor (10) to earth.
Steer the steering wheel so that the steering output shaft angle is bigger than 5o.
The ZF-Servocom RAS must not co-steer.
If the ZF-Servocom RAS co-steers, the failure must be removed - see troubleshooting.
Disassembly / Installation
Tool [3]
Master cylinder
Tool [4]
Centering cylinder
ZF-Servocom RAS8
5 Disassembly of the ZF-Servocom RAS
Attention:Note the safety instructions in section 2.
5.1 Master and centering cylinders
Mark connections and installed position of cylinders.
Disconnect master and centering cylinders and drain oil.
5.2 Hydraulic accumulator
Unscrew union piece from hydraulic accumulator.
Release catches and remove hydraulic accumulator.
6 Installation of the ZF-Servocom RAS
6.1 Master and centering cylinders
6.1.1 Preparing cylinders for installation
Move piston rod to middle position.
Mount tool on piston rod so that bevel on left-hand side (see arrow on tool) positively engagesthe bevel at the end of the piston rod. Move piston rod until the right-hand side of the tool (tool[3]) or the shoulder (tool [4] - see marking on tool) contacts the face end of the cylinder.
Fill master and centering cylinders with oil.
Oil grade:Only oil grades approved by the vehicle manufacturer (e.g. Pentosin CHF 11S) may be used in theZF-Servocom RAS (without ZF-Servocom steering). The oil must not be mixed with other grades.
Attention:In the case of the master cylinder, only ports L1, L2 and L3 in the centre of the cylinder (see diagramon page 6) may be filled with the above oil grade.The external ports L4 and L5 must be filled with the oil grade used in the ZF-Servocom or frontaxle steering.
6.1.2 Installation instructions
Screw ball joint onto piston rod.
Attention:
Note values X and Y for the minimum screw depth.
Installation / Charging with gas
Value X
Piston rod
Value Y
Cylinder pipe
9ZF-Servocom RAS
Value X (piston rod): Master cylinder: max. 13 mm (for 8346 974 163:max. 31.5 mm)Centering cylinder: max. 31.5 mm
Value Y (cylinder pipe): Master cylinder: max. 14 mmCentering cylinder: max. 19 mm
Oil the mating faces and screw thread of the ball joint.
Turn the steered wheels into the exact straight-ahead position.
Install the master and centering cylinders so that the line connections point upwards.
Screw the ball joint mounted on the cylinder pipe onto the frame (master cylinder) and axle (cente-ring cylinder) and lock it in place.
Tightening torque:Clamp: 45...50 NmCastellated nut: 250...280 Nm (for 8346 974 163: 210...230 Nm)
Move piston rod to middle position as described in section 6.1.
Oil the screw thread and mating face.
After connection to the piston rod, fit the ball joint into the wheel steering lever by twisting andturning.
Attention:Note values X and Y.Tighten (torque see above) and secure the clamp and castellated nut.
Check sealing edges, sealing faces and sealing rings of the connections for signs of damage.
Connect the piping so that it is oil-tight.
Following the installation of the centering and the master cylinder, the chassis geometry must bemeasured and readjusted, if necessary.
6.2 Hydraulic accumulator
Insert hydraulic accumulator in union piece and secure it.
Tighten union piece (Ermeto GE) with a torque of 80+10 Nm.
7 Charging with gas
Connect tool [1] to connection A2 as described in section 4.2.2.
Attention:Only nitrogen may be used as the charging gas. Explosion hazard!Only nitrogen cylinders with pressure reducing valve and relief valve may be used.
Connect charging hose to tool [1] and nitrogen cylinder.
Charging with gas / Filling with oil / Bleeding
Spindle A
Valve B
Tool [1]
ZF-Servocom RAS10
! Set pressure reducing valve to 10+1 bar (see note on page 1).
! Slowly open the shutoff valve on the nitrogen cylinder.
! Open valve B of tool [1].
! When the accumulator pressure reaches 10+1 bar (see note on page 1),close the shutoff valve on the cylinder and valve B on tool [1].
! Check the accumulator pressure again after waiting 5 minutes, during which time the temperatureis equalized.
! Remove tool [1] as described in section 4.2.2.
! Close the valve of the hydraulic accumulator as described in section 4.2.2.
8 Filling with oil
! Oil grade:Only oil grades approved by the vehicle manufacturer (e.g. Pentosin CHF 11S) may be used in theZF-Servocom RAS (without ZF-Servocom steering). The oil must not be mixed with other grades.
! Amount of oil:Approx. 6 litres are required to fill the complete ZF-Servocom RAS (without ZF-Servocom steeringor front axle steering).
! Move master cylinder to middle position (see section 6.1).
! Connect tool [2] to connection A1. Fill the oil tank of tool [2] with oil (oil grade as above) in orderto avoid pumping air.
! In order to facilitate the filling and subsequent bleeding process, it is advisable to open some of thebleeder valves of lines L3, L1 and L2 (see diagram on page 6) and to close them again when oilemerges.
! Increase the system pressure to 15+1 bar (see note on page 1) by actuating the hand pump.
9 Bleeding
9.1 ZF - Servocom RAS
! Connect tool [2] to connection A1. Fill the oil tank of tool [2] with oil (oil grade as above) in orderto avoid pumping air.
! Actuate the hand pump of tool [2] to build up pressure and ensure that the system is pressurizedduring the entire bleeding process.
Bleeding / Settings and tightening torques
11ZF-Servocom RAS
! Open the highest bleeder valve in line L3 until air bubbles no longer escape; then reclose it so thatit is oil-tight.
! Open the other bleeder valves in line L3 and then reclose them so that they are oil-tight.
! Bleed lines L1 and L2 as described above.
! Bleed the cylinder ports and then reclose them so that they are oil-tight.
! Check the system pressure. Required: 15+1 bar (see note on page 1)
9.2 ZF-Servocom or front axle steering and corresponding circuit of master cylinder
! Start the engine.
! Open the bleeder valves or ports of lines L4 and L5 until air bubbles no longer escape; then reclosethem so that they are oil-tight.
! Turn the steering from one limit position to the other several times.
! This allows any remaining air in the oil to escape via the oil tank.
! The oil level in the oil tank may rise by 1...2 cm when the engine is switched off and the systemhas been fully bled.
9.3 Bleed the ZF-Servocom RAS again as described in section 9.1
! Check the system pressure. Required: 15�1 bar (see note on page 1)
! Remove tool [2].
10 Settings and tightening torques
- Settings:
Accumulator pressure: Check: 10+1/-3 bar (see note on page 1)Charging: 10�1 bar (see note on page 1)
System pressure: Check: 15+1/-3 bar (see note on page 1)Charging: 15�1 bar (see note on page 1)
Value X: Master cylinder: max. 13 mm (for 8346 974 163max. 31.5 mm)Centering cylinder: max. 31.5 mm
Value Y: Master cylinder: max. 14 mmCentering cylinder: max. 19 mm
- Tightening torques:
Hydraulic accumulator: Hexagon socket head screw 25 NmUnion piece (Ermeto GE) 80+10 Nm
Master and centering cylinders: Clamp 45...50 NmCastellated nut 250...280 Nm
(for 8346 974 163: 210...230 Nm)
Special tools
ZF-Servocom RAS12
11 Special tools
Note:The special tools listed below refer to the standard version and the design version on the basis of whichthe entire manual has been compiled. Other tools may consequently be required for the particular unitin question.
Part. No.
Tool [1]
Test device 7016 798 516
Tool [2]
Hydraulic unit for 7418 798 563filling with oil
Tool [3]
Gauge for 8346 798 301master cylinder
(For 8346 974 163:8346 798 303)
Tool [4]
Gauge for 8346 798 302centering cylinder
13
12 Troubleshooting
This troubleshooting procedure presupposes that there The applicated letters and numbers (e.g. 2, L5) refer to the illustration areno defects in the front axle steering! on page 17.
Attention: Note the safety instructions in section 2.
Fault Cause Check Remedy
Pressure switch ! Loss of oil; ! Check steering system ! Eliminate cause of leak.indicator lights up when external leak in system for external leaks (visual examination) Fill system with oil 15�1 bar (see notevehicle power supply is and system pressure - required: on page 1) and bleed it.switched on 15+1-3 bar (see note on page 1) See operating instructions.
! Internal leak in ! Check oil level in oil ! Seal or replace cylindermaster cylinder (2) tank (is too high)
! Hydraulic accumulator (4) ! Check maximum pressure ! Charge hydraulic accumulatordefective in hydraulic accumulator - required: with nitrogen or replace it.
10 +1/-3 bar (see note on page 1) 10�1 bar (see note on page 1)- see operating instructions
! Internal leak in ! Open screw plug A3 ! Seal or replace centering cylindercentering cylinder (3) - oil must not emergeoil leaking from L3 to A3
Pressure switch indicator lights ! Press switch (6) defective ! Check correct functioning of ! Replace pressure switchup when vehicle power supply pressure switch as directed by vehicleis switched on although manufacturerRAS is functioning correctly
Indicator does not light ! Contact of pressure ! Check correct functioning of pressure ! Replace pressure switchup although RAS is not switch (6) is sticking switch as directed by vehiclefunctioning correctly manufacturer
! Indicator defective ! Check correct functioning of indicator ! Replace indicator
! Electric lead defective ! Check wiring for continuity with the aid ! Replace wiring or repair breakof a multi-purpose measuring instrument in connection
Oil tank indicator ! Internal leak in master cylinder ! Check system pressure ! Seal or replace cylinderlights up while steering (2) - oil leaking leaking (is too high) - required:
from L5 to L2 or from L4 to L1 15+1-3 bar (see note on page 1)
14
Fault Cause Check Remedy
Synchronization error. ! Mechanical connecting elements ! Visual examination of ! Replace defective partsRear axle does not centre between axle (ball joints, mechanical connecting elementsback to the precise piston rod, steering knuckle,straight-ahead position etc.) and cylinder are stiff,- only when stationary bent, with backlash- also when driving- in one direction- in both directions
! Air in RAS steering system ! Bleed steering system and ! Fill system with oil 15�1 barcheck system pressure - required: (see note on page 1) and bleed it15 +1 -3 bar (see note on page 1) (see operating instructions)
! Geometry of rear ! Check rear axle for ! Set axle values as directedaxle not OK specified axle values by vehicle manufacturer
! System pressure ! Check steering system for external ! Repair leaktoo low, external leak leaks (visual examination) and check Fill with oil 15�1 bar (see note on
existing system pressure - required: page1) and bleed system15 +1 -3 bar (see note on page 1) (see operating instructions)
! Gas pressure of ! Check accumulator pressure ! Charge hydraulic accumulator withaccumulator (4) too low - required: 10+1-3 bar (see note on nitrogen 10+1 bar (see note on page 1)
page 1) or replace it (see operating instructions)
! Internal leak in centering ! Remove screw plug (A3) - oil must not ! Seal or replace cylindercylinder (3) - oil leaking emerge from the open cylinder port.from L3 to A3
Middle position of master ! Set wheels to straight-ahead position. ! Set cylinders to middle position withand/or centering cylinder Check middle position of piston rod wheels in straight-ahead position.offset in relation to in master and centering cylinders See operating instructionsstraight-ahead position for settingof wheels
15
Fault Cause Check Remedy
Synchronization error ! Air in RAS steering system ! Check steering system for ! Eliminate cause of infiltrated air.Rear axle remains in external leaks Fill system with oil 15�1 bar (see note onstraight-ahead position page 1) - see operating instructionsand does not turn- only when stationary ! Too little oil in the RAS system. ! Check steering system for Eliminate cause of leak.- also when driving External leak in piping or in external leaks (visual examination) Fill system with oil 15�1 bar (see note on- in one direction master and/or centering cylinder and existing system pressure - required: page 1) and bleed it- in both directions 15+1-3 bar (see note on page 1)
! Leak in control system of ! Check oil leakage at cylinder ports ! Seal or replace cylindermaster cylinder (2) - oil leaking L1 to L3 or L2 to L3, as appropriate.from L1 or L2 to L3 Turn front axle in the corresponding
direction to be checked.Unscrew and seal lineL1 to L3 or L2 and L3.Set system pressure of RAS in lineL2 or L1 to 20 bar on Minimess port.Measure leakage oil at open cylinderports for approx. 1 minute.No more than 0.02 dm3/minoil may emerge from both ports takentogether.
! Leak in main cylinder part of ! Set wheels to straight-ahead ! Seal or replace cylindercentering cylinder (3) - oil position and check oil leakageleaking from L1 to L2 or vice at cylinder portsversa L1 or L2, as appropriate.
Unscrew line L1 or L2from cylinder and seal it.Set system pressure to 20 bar viaconnection A1.Oil must not emerge from the opencylinder port.
16
Fault Cause Check Remedy
! Leak from main cylinder part ! Set wheels to straight-ahead position ! Seal or replace cylinderof centering cylinder (3) to and check oil leakage at cylinder portcentering cylinder part L3.- oil leaking from L1 to L3 Unscrew and seal line L3.
Set system pressure of RAS to 20 barvia connection A1.Oil must not emerge fromthe open cylinder port.
! Lines no longer allow oil to pass ! Check piping and hoses for signs ! Replace damaged pipingthrough of damage.
Measure system pressure atthe corresponding end of the piping.
Additional information for versions with cut-off valve (8)
ZF-Servocom RAS ! Defective cut-off valve (8) ! Start the engine. Interrupt connection ! If ZF-Servocom RAS does notNo function between main power supply and function replace cut-off valve (8).
cut-off valve
! Defective switch relay (9) ! Switch on ignition (engine off)Take off main power supply plug from ! Replace switch relay (9).cut-off valve (8). Measure voltage.Nominal value: main power supply ! No main power supply voltagevoltage. Start engine. Measure voltage. => replace switch relay (9)Nominal value: 0V
! Defective signal sensor ! Check switching function. ! Replace signal sensor(e.g.flow rate indicator)
Legend to diagrams on page 17/18:
1 front axle steering 6 pressure switch L1/L2 hydrostatic connecting line to master- and centering cylinder2 masterzylinder 7 connecting rod L3 pressure line3 centering cylinder 8 cut-off valve L4/L5 connecting line from front axle steering to mastercylinder4 hydraulic accumulator 9 switch relay A1 connection tube (oil side)5 hydraulic lines 10 signal sensor A2 connection tube at hydraulic accumulator (gas side)
(e.g. flow rate indicator) A3 closing screw (centering cylinder)(E) bleeder valve
A, B, C, D, E, X, Y, T, W, V connection identification sticked up at the aggregates
17
Version without cut-off-valve (8)
Company instruction PAUL NUTZFAHRZEUGE
BLEEDING GUIDE FOR ZF-SERVOCOM
1. Lift vehicle frame on front side.
2. Move steering straight ahead.
3. Stop engine during bleeding .
4. Connect hydraulic pump to non return valve beneath centering cylinder
(see photo).
5. Increase system pressure to 15 bar with hydraulic pump.
6. Attention: Use only Pentosin CH11S (DC-No.: A00 198 03 10), complete
filling appr. 6 ltr.
7. Loose slightly cap nut of pressure switch (close to master cylinder),
hydraulic line L3 and release air. Close cap nut.
8. Bleeding MINIMESS-connectors by turns (hydraulic line L1 and L2).
9. Increase in between system pressure to appr. 15 bar. Minimum pressure
during bleeding > 10 bar.
10. Star engine an steer slowly 5 times left to right to left.
11. Stop engine and steer straight ahead.
12. For oil calming down wait appr. 10 minutes.
13. Repeat bleeding procedure for hydraulic line L1 and L2.
14. Increase hydraulic system pressure to 15 bar.
15. Final performance control.
