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Installation
Bosch Rexroth AB, Installation and maintenance manual, Hägglunds DOb, RE 15327-WA/05.2017
7.5 Pipe work, internal
General
The drive unit should be placed as close to the hydraulic motor as possible, taking
other circumstances (e.g. space, environmental conditions ) into consideration.
The main connections of the main pump and the hydraulic motor must always be
fitted to the piping with hoses. We recommend to use shut off valves for the main
lines A and B. The protections on all parts must be kept on until final assembly to
avoid dirt in the system.
Storage of included components
The included components shall be stored according to 6.1: Storage of the packed
drive unit.
Handling of fittings
General
Inspect the sealing surfaces on the couplings visually before mounting. It must be
free from any damages. Handle the couplings with care. Check that the sealing (if
any) is in its right position, free from cracks and that it is saturated with oil .
The dirt protections on the fittings must be kept on until final assembly.
Flange fittings
The flange screws must be tightened crosswise.
Ermeto type, tube fittnings, 24
• Tighten the fittning nut with wrench until it stops. Tighten additional 1/6 turn to
1/4 turn.
• Use correct size of tool, to avoid fitting to be damaged and difficult to remove.
BSPP (G) fittings
1. For dimension 1" and larger, if necessary, spray nut abutment with a volatile oil
like WD-40. This is done so that the nut should run as smoothly as possible and
to prevent twisting of the hose when the nut is tightened.
2. Screw on the nut with your fingers. Wiggle a little on the hose during the install to
check that the cone on the hose fitting has the right position in the cone on the
mating fitting and that the sealing surfaces have been met.
3. Tighten the nut with the intended spanner. Recommended torque available from
the table below.
Thread
G 3/4-14
G 1-11
If a torque wrench is not available, a rule of thumb is that the nut should be
tighten additional 1/4 to 1/2 turn after the nut has been tightened so that the
hose can not be turned.
4. Check that the hose doesn't get twisted when the nut is tightened.
o
cone, soft seal (DIN 3861, ISo 8434-4)
Tightening torque (Nm)
90-135
120-160
Tightening torque (ibf ft)
65-100
90-120
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