About this product 23/68
RE 92003-01-B/12.2015, A4VG Series 32,
Bosch Rexroth AG
5.3.1 Bypass function size 28 to 56
The standard version of the A4VG 28–56 variable pump has
no
high-pressure relief
valves with bypass function. If necessary, this must be specified when ordering.
1
2
1
2
1
2
Fig. 3: Activating the bypass function size 28 to 56
To activate the bypass function:
1.
Switch off the combustion engine.
2.
Remove the plastic tamper-proof cap (1) of the high-pressure relief valve with a
suitable tool (e.g. gripper).
3.
Loosen the lock nut (
2
) by turning counter-clockwise one half rotation with a
hexagon head screw (WAF 13).
4.
Use a hexagon socket wrench (WAF 4) to screw in the screw (
1
) clockwise
until the screw (
1
) is against the spring seat. This is apparent by the increased
resistance. Then screw the screw (
1
) one half turn into the spring seat.
5.
Tighten the lock nut (
2
) clockwise with a torque of 22 Nm.
The plastic tamper-proof cap is destroyed when removing.
The maximum towing speed is dependent on the gear ratio in the vehicle and must
be calculated by the vehicle manufacturer. The corresponding flow of
q
V
= 30 l/min
may not be exceeded.
CAUTIOn!
Impermissible heat generation and insufficient lubrication.
Risk of burning or property damage. High towing speeds and long towing distances
result in impermissible heat generation and insufficient lubrication. This overheats
and damages the axial piston unit.
▶
Wear heat-resistant protective clothing, e.g., gloves.
▶
Only tow the vehicle out of the immediate danger zone.
The vehicle may only be towed out of the immediate danger zone.
Activating the
bypass function
Towing speed
Towing distance
