Bosch Rexroth H-4WEH...XE Series - Page 27

Assembly 27/52
RE24751-XE-B/10.19, H-4WEH...XE..., BoschRexrothAG
NOTICE
Wear, tear and malfunctions!
The cleanliness of the hydraulic fluid has a considerable impact on the cleanliness
and life cycle of the valve. Any contamination of the hydraulic fluid will result in
wear and malfunctions. Particularly foreign particles may damage the valve.
▶ Always ensure absolute cleanliness.
▶ Install the valve in clean condition.
▶ Make sure that all connections, hydraulic lines and attachment parts are clean.
▶ Ensure that no cleaning agents are able to penetrate the hydraulic system.
▶ Only use seal kits as listed in chapter10.6 "Spare parts".
1. Before any assembly and disassembly work starts, the environment must be
cleaned so that no dirt can get into the oil circuit. Only fiber-free cloth or special
paper may be used for cleaning.
2. Remove existing preservative agent.
3. Check the valve contact surface for the required surface quality
(see"Datasheet24751-XE"). Remove the protective plate from the valve and keep
it safe for returns in case any repairs become necessary later.
4. Dry the valve connection surface using suitablecleaning materials.
5. Check the seal rings at the valve connection surface for completeness.
Othersealants are not admissible.
6. Place the valve on the contact surface.
Only use valve mounting screws with the thread diameters, screw lengths and
strength properties listed in chapter7.6 "Required accessories".
Always fasten the valve with all valve mounting screws (for the number of valve
mounting screws, please refer to table9) as otherwise, leak-tightness is not
guaranteed.
7. When using the subplates mentioned under chapter7.6 "Required accessories"
orin case of assembly on comparable cast iron installation surfaces, tighten
all valve mounting screws with the tightening torque specified in table9
(withafriction coefficient of µ
total
=0.09...0.14). This tightening torque refers to
the maximum admissible operating pressure.
Table 9: Bolt dimension and tightening torque with admissible tolerance
Size Bolt dimension Tightening torque
with admissible tolerance
Number of valve
mounting screws
NG10 M6x45 - 10.9 12.5Nm ±10% 4
NG16 M10x60 - 10.9 58.0Nm ±10% 4
M6x60 - 10.9 12.5Nm ±10% 2
NG25 M12x60 - 10.9 100.0Nm ±10% 6
NG32 M20x80 - 10.9 340.0Nm ±10% 6