Model | 375.3, 930.0/1/2, 932.0/1/2, 933.1, 934, 940, 942.1, 943.1, 944, 950.5/6, 952.5/6, 953.6, 954.5 |
HEMA steering HD900 | |
Model | 375.3, 930.0/1/2, 932.0/1/2, 933.1, 934, 940, 942.1, 943.1, 944, 950.5/6, 952.5/6, 953.6, 954.5 |
SteeringRB8098 | |
Model | 375.3, 930.0/1/2, 932.0/1/2, 933.1, 934, 940, 942.1, 943.1, 944, 950.5/6, 952.5/6, 953.6, 954.5 |
SteeringZF8098 |
Steering RB8098, steering ZF8098 2nd generation, steering HEMA HD900 |
1 | Steering gear |
2 | Elbow fitting (without test connection) |
3 | Elbow fitting (with test connection) |
3.1 | Screw plug |
W46.20-1136-06
Steering RB8098, steering ZF8098 2nd generation, steering HEMA HD900 |
3 | Elbow fitting (with test connection) |
3.1 | Screw plug |
4 | Test connection |
5 | Hose |
6 | Pressure gage |
W46.20-1135-03
W46.20-1141-08
Steering ZF8098 1st generation |
1 | Steering gear | 5 | Hose | 7 | Screw plug | ||
4 | Test connection | 6 | Pressure gage |
Vehicles with adjustable hydraulic steering limiters |
1 | Steering gear |
11 | Screw plug |
12 | Adjustment screw (for left hydraulic steering limiter on left-hand drive vehicles; for right hydraulic steering limiter on right-hand drive vehicles) |
13 | Adjustment screw (for right hydraulic steering limiter on left-hand drive vehicles; for left hydraulic steering limiter on right-hand drive vehicles) |
W46.20-A017-01
W46.20-A019-01
W46.20-A020-01
W46.20-A021-01
W46.20-A022-01
Vehicles with automatically adjusting hydraulic steering limiters |
1 | Steering gear |
15 | Adjustment screw (for left hydraulic steering limiter on left-hand drive vehicles; for right hydraulic steering limiter on right-hand drive vehicles) |
1 | Steering gear |
16 | Adjustment screw (for right hydraulic steering limiter on left-hand drive vehicles; for left hydraulic steering limiter on right-hand drive vehicles) |
17 | Sliding bush |
Shown on LHD vehicle |
9 | Stop screw |
10 | Distance sleeve |
W46.20-1106-11
Danger | Risk of death caused by vehicle slipping or toppling off during lifting | Only lift vehicle at the lift support points specified by the vehicle manufacturer. | |
Warning | Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running. | Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. | |
Warning | Risk of injury to skin or eyes from hydraulic fluid spraying out under pressure.Risk of poisoning from swallowing hydraulic fluid. | Depressurize hydraulic system completely before starting any work on it. Wear protective clothing and safety glasses. | |
Warning | Danger of injury to eyes caused by steering oil emerging at high pressure. Danger of poisoning caused by swallowing steering oil | The setting screws for the hydraulic steering limiters must be turned in by at least three rotations. Wear protective gloves, protective clothing and safety glasses. | |
Warning | Risk of injury from being trapped in the swivel range of steered axles | Ensure that no persons or objects are in the swivel range of all steered axles when turning the steering wheel. Do not stand in the swivel range of the additional steering axle when the engine is running. | |
Warning | Risk of injury to skin or eyes from hot hydraulic fluid spraying out under high pressure. Risk of burn injuries from contact with components heated by hot hydraulic fluid. Risk of poisoning from swallowing hydraulic fluid | Do not make any technical modifications to the pressure gauge or the test equipment. Check the pressure gauge and test equipment for mechanical damage each time prior to use. Observe the flow diagram when connecting the test equipment. Wear protective gloves, protective clothing and safety glasses. | |
Warning | Risk of accident and injury caused by diagnostic equipment in vehicle while traveling | Never use the test equipment to verify the delivery rate and oil pressure of the power steering pump or the pressure gauge while driving. | |
Warning | Risk of injury caused by body parts being pinched or crushed as cab is tilted | Ensure that no one is within the tilting range of the cab as it is being tilted. Always tilt the cab all the way to the end position and secure it with the safety strut. | |
Topical note | Special instructions for lifting and supporting vehicle | ||
Topical note | Notes on maintenance and repair work | ||
Topical note | Notes on tilting the cab | ||
Note on calculation of tightening torque when using insertion or socket tools with various effective lengths | |||
| Check | ||
1.1 | Move vehicle to driving level using level control system operating unit. | On vehicles with code A00 (Front axle, air-sprung) | |
1.2 | Vehicle loaded as much as possible according to the predominant operating conditions. | On vehicles without code A00 (Front axle, air-sprung) | |
In isolated cases, due to the steering kinematics, an excessively low front axle load can result in the setting pressure of the steering limiter not being reached or it cannot be adjusted. | |||
2 | Move front wheels to straight-ahead position. | ||
3 | Secure vehicle to prevent it moving away. | ||
4 | Remove noise encapsulation under steering gear (1). | ||
5 | Open maintenance flap. | ||
6 | Tilt cab. | ||
7 | Remove boot from steering gear. | ||
8 | Replace elbow fitting (2) with elbow fitting (3). | Only on vehicles in which elbow fitting (2) is installed. | |
The elbow fitting (3) can be ordered using part number A 004 997 20 71 and it remains installed after the test. | |||
Union nut, steering gear oil line/hose | |||
SteeringZF8098Oil pressure line fitting to steering gear | |||
SteeringRB8098Oil pressure line fitting to steering gear | |||
HEMA steering HD900Oil pressure line fitting to steering gear | |||
9.1 | Remove screw plug (7) from steering gear (1). | On vehicles with steering ZF8098 1st generation. | |
Collect escaping oil in suitable container. | |||
9.2 | Unscrew screw plug (3.1) from elbow fitting (3). | On vehicles in which elbow fitting (3) is installed. | |
Collect escaping oil in suitable container. | |||
10 | Install test connection (4). | The test connection (4) can be ordered using part number A 942 351 00 69. | |
Steering ZF8098 without elbow fittingTest connection to steering gear | |||
Steering ZF8098 with elbow fittingTest connection to elbow fitting | |||
SteeringRB8098Test connection to elbow fitting | |||
HEMA steering HD900Test connection to elbow fitting | |||
11 | Connect hose (5) to manometer (6). | Pressure gage | |
Hose | |||
12 | Unscrew cap from test connection (4). | ||
13 | Connect hose (5) to test connection (4). | ||
14 | Remove screw plugs (11). | Only on vehicles with adjustable hydraulic steering limiters | |
15.1 | Remove setting screws (12, 13). | On vehicles with adjustable hydraulic steering limiters | |
Collect escaping oil in suitable container. | |||
15.2 | Remove setting screws (15, 16). | On vehicles with automatically adjusting hydraulic steering limiters | |
Collect escaping oil in suitable container. | |||
16 | Press sliding bushings (17) all the way onto setting screws (15, 16) with the aid of a vise. | Only on vehicles with automatically adjusting hydraulic steering limiters | |
17.1 | Install screw plugs (11). | On vehicles with adjustable hydraulic steering limiters | |
SteeringZF8098Screw plug for setting screw of hydraulic steering limiter to steering gear | |||
HEMA steering HD900Screw plug for setting screw of hydraulic steering limiter to steering gear | |||
SteeringRB8098Screw plug for setting screw of hydraulic steering limiter to steering gear | |||
17.2 | Install setting screws (15, 16). | On vehicles with automatically adjusting hydraulic steering limiters | |
Adjustment bolt of automatically-adjusting hydraulic steering limiter in steering gear | |||
18 | Fill and bleed steering gear oil. | ||
Leave front axle raised after bleeding. | |||
19 | Place one self-fabricated spacer sleeve (10) each on left and right stop screw (9). | ||
| Spacer sleeve for steering stop | ||
20 | Start engine and run at idle speed. | ||
21 | Turn steering to left or right several times using normal force of the hand until a steering gear oil temperature of approx. 50 °C is reached in the steering. | | |
22 | Turn steering wheel left up to mechanical end stop using normal force of the hand, read off pressure at manometer (6), and release steering wheel again. | | |
23 | Note down measured pressure. | ||
24 | Turn steering wheel to right up to mechanical end stop using normal force of the hand, read off pressure at manometer (6), and release steering wheel again. | | |
25 | Note down measured pressure. | ||
26 | Move front wheels to straight-ahead position. | ||
27 | Switch off engine. | ||
28 | Compare noted pressures with intended rated pressure. | Rated pressure (= governed pressure of pressure limiting valve in steering gear) | |
If both pressures are equal and correspond with the intended rated pressure. | |||
| |||
Look for cause of possible problems in power-steering pump or mechanical component parts (pressure limiting valve, seals in steering gear (1) and, if applicable, in auxiliary hydraulic cylinder are OK). | |||
If one of the two pressures is below the intended rated pressure, but the other pressure matches the intended rated pressure and the vehicle does not have an auxiliary hydraulic cylinder: | |||
| |||
Replace steering gear (1) (the power-steering pump and the pressure limiting valve can be ruled out as the cause of the problems). | |||
| |||
| |||
If one of the two pressures is below the intended rated pressure, but the other pressure matches the intended rated pressure and the vehicle has an auxiliary hydraulic cylinder: | |||
| |||
Remove hydraulic lines to hydraulic cylinder from steering gear (1) or hydraulic cylinder, seal connections with suitable stop plugs so that a leakage in the hydraulic cylinder can be ruled out, and repeat test. | |||
For an M18x1.5 inside thread, use stop plugs with part number A 000 997 70 73. For other thread sizes, procure stop plugs commercially. The stop plugs must be designed for a pressure of approx. 200 bar. | |||
Union nut, steering gear oil line/hose | |||
If one of the two pressures is still below the intended rated pressure, but the other pressure matches the intended rated pressure: | |||
| |||
Replace steering gear (1) (power-steering pump, pressure limiting valve and hydraulic cylinder can be ruled out as cause of problems). | |||
| |||
| |||
If both pressures are equal and correspond with the intended rated pressure. | |||
| |||
Replace hydraulic cylinder (steering gear (1) can be ruled out as cause of problems). Then reconnect hydraulic lines to steering gear or hydraulic cylinder. | |||
Remove/install hydraulic cylinder of 1st front axle | |||
Remove/install hydraulic cylinder of 1st front axle | |||
Union nut, steering gear oil line/hose | |||
If both pressures are equal, but deviate from the intended rated pressure. | |||
| |||
Replace pressure limiting valve on steering gear (1) and repeat test. | |||
If both pressures are equally high after replacing pressure limiting valve, but are below the intended rated pressure: | |||
| |||
Check delivery rate and oil pressure of power-steering pump (to rule out any defect at power-steering pump). | |||
If delivery rate and oil pressure of power-steering pump are OK and vehicle has no auxiliary hydraulic cylinder: | |||
| |||
Replace steering gear (1). | |||
| |||
| |||
If delivery rate and oil pressure of power-steering pump are OK and vehicle is equipped with an auxiliary hydraulic cylinder: | |||
| |||
Remove hydraulic lines to hydraulic cylinder from steering gear (1) or hydraulic cylinder, seal connections with suitable stop plugs so that a leakage in the hydraulic cylinder can be ruled out, and repeat test. | |||
Union nut, steering gear oil line/hose | |||
If both pressures are still below the intended rated pressure: | |||
| |||
Replace steering gear (1). | |||
| |||
| |||
If both pressures are equal and correspond with the intended rated pressure. | |||
| |||
Replace hydraulic cylinder (steering gear (1) can be ruled out as cause of problems). Then reconnect hydraulic lines to steering gear (1) or hydraulic cylinder. | |||
Remove/install hydraulic cylinder of 1st front axle | |||
Remove/install hydraulic cylinder of 1st front axle | |||
Union nut, steering gear oil line/hose | |||
29 | Tilt cab. | ||
30 | Remove spacer sleeves (10) from stop screws (9). | ||
31 | Remove screw plugs (11). | Only on vehicles with adjustable hydraulic steering limiters | |
Collect escaping oil in suitable container. | |||
32.1 | Install setting screws (12, 13). | On vehicles with adjustable hydraulic steering limiters | |
32.2 | Replace setting screws (15, 16). | On vehicles with automatically adjusting hydraulic steering limiters | |
Collect escaping oil in suitable container. | |||
Adjustment bolt of automatically-adjusting hydraulic steering limiter in steering gear | |||
33 | Fill and bleed steering gear oil. | ||
When tilting back the cab for bleeding, make sure that the hose (5) and manometer (6) are not pinched. | |||
Vehicles with adjustable hydraulic steering limiters | |||
Vehicles with automatically adjusting hydraulic steering limiters | |||
34 | Position front wheels centrally on turn plates. | Only on vehicles with adjustable hydraulic steering limiters | |
35 | Adjust hydraulic steering limiter. | Only on vehicles with adjustable hydraulic steering limiters. | |
Adjustment pressure for steering limiter | |||
Screw-in depth of setting screw for hydraulic steering limiter (distance between bolt head of setting screw and contact surface of bolt head of screw plug) | |||
SteeringZF8098Screw plug for setting screw of hydraulic steering limiter to steering gear | |||
HEMA steering HD900Screw plug for setting screw of hydraulic steering limiter to steering gear | |||
SteeringRB8098Screw plug for setting screw of hydraulic steering limiter to steering gear | |||
Pressure gage | |||
Hose | |||
36 | Tilt cab. | Only on vehicles with adjustable hydraulic steering limiters | |
37 | Detach hose (5) from test connection (4). | Collect escaping oil in suitable container. | |
38 | Screw cap onto test connection (4). | ||
39 | Detach hose (5) from manometer (6) and seal all connections. | ||
40 | Remove test connection (4). | Collect escaping oil in suitable container. | |
41.1 | Screw screw plug (7) into steering gear (1). | On vehicles with steering ZF8098 1st generation. | |
Test connection screw plug to steering gear | |||
41.2 | Screw screw plug (3.1) into elbow fitting (3). | On vehicles with elbow fitting (3). | |
SteeringZF8098Screw plug to elbow fitting | |||
SteeringRB8098Screw plug to elbow fitting | |||
HEMA steering HD900Screw plug to elbow fitting | |||
42 | Raise vehicle at front axle, remove all turn plates and lower vehicle back onto ground. | Only on vehicles with adjustable hydraulic steering limiters | |
43 | Check steering gear oil level; correct if necessary. | Steering gear oil | |
44 | Attach boot to steering gear. | ||
45 | Tilt back cab. | ||
46 | Close maintenance flap. | ||
47 | Install noise encapsulation under steering gear (1). | ||
48 | Conduct a road test. | During the test drive, check the overall steering ability of the vehicle. | |
49 | Check steering gear (1) for leak tightness. | Visual inspection. |
Test values for steering gear |
Number | Designation | HEMA steering HD900, RB8098, ZF8098 in model 375, 930, 932, 933, 934, 940, 942, 943, 944, 950.5/6, 952.5/6, 953.6, 954.5 (Left-hand drive vehicle) without code A00 | HEMA steering HD900, RB8098, ZF8098 in model 375, 930, 932, 933, 934, 940, 942, 943, 944, 950.5/6, 952.5/6, 953.6, 954.5 (Right-hand drive vehicle) without code A00 | |
BE46.20-N-1001-01I | Screw-in depth of setting screw for hydraulic steering limiter (distance between bolt head of setting screw and contact surface of bolt head of screw plug) | mm | 4 | 4 |
For picture, see | ||||
Test values for steering gear |
Number | Designation | HEMA steering HD900, RB8098, ZF8098 in model 375, 930, 932, 933, 934, 940, 942, 943, 944, 950.5/6, 952.5/6, 953.6, 954.5 with code A00 | |
BE46.20-N-1001-01I | Screw-in depth of setting screw for hydraulic steering limiter (distance between bolt head of setting screw and contact surface of bolt head of screw plug) | mm | 4 |
For picture, see | |||
Test values for steering gear |
Number | Designation | HEMA steering HD900, RB8098, ZF8098 in model 375, 930, 932, 933, 934, 940, 942, 943, 944, 950.5/6, 952.5/6, 953.6, 954.5 (Left-hand drive vehicle) without code A00 | HEMA steering HD900, RB8098, ZF8098 in model 375, 930, 932, 933, 934, 940, 942, 943, 944, 950.5/6, 952.5/6, 953.6, 954.5 (Right-hand drive vehicle) without code A00 | ||||
BE46.20-N-1002-01I | Adjustment pressure for steering limiter | Vehicle unladen | Steering to left | Specified value | bar | 50 (+10) | 30 (+10) |
at engine speed | 1/min | 800 | 800 | ||||
Steering to right | Specified value | bar | 30 (+10) | 50 (+10) | |||
at engine speed | 1/min | 800 | 800 | ||||
Load vehicle | Steering to left | Specified value | bar | 40 (+10) | 40 (+10) | ||
at engine speed | 1/min | 800 | 800 | ||||
Steering to right | Specified value | bar | 40 (+10) | 40 (+10) | |||
at engine speed | 1/min | 800 | 800 |
Test values for steering gear |
Number | Designation | HEMA steering HD900, RB8098, ZF8098 in model 375, 930, 932, 933, 934, 940, 942, 943, 944, 950.5/6, 952.5/6, 953.6, 954.5 with code A00 | ||||
BE46.20-N-1002-01I | Adjustment pressure for steering limiter | Vehicle unladen | Steering to left | Specified value | bar | 40 (+10) |
at engine speed | 1/min | 800 | ||||
Steering to right | Specified value | bar | 40 (+10) | |||
at engine speed | 1/min | 800 | ||||
Load vehicle | Steering to left | Specified value | bar | 40 (+10) | ||
at engine speed | 1/min | 800 | ||||
Steering to right | Specified value | bar | 40 (+10) | |||
at engine speed | 1/min | 800 |
400 589 01 91 00
Hose
000 589 06 21 00
Pressure gage
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