Bosch rexroth 1 Series - Testing hydraulic fluid supply; Performing a functional test

Commissioning 51/68
RE 93100-01-B/2019-09-10, A20V(L)O Series 1, Bosch Rexroth AG
5. Operate theaxial piston pump atalow rotational speed (starter speed
for internal combustion engines and/orinching mode for electric motors)
until thehydraulic system iscompletely filled and air bled. To verify, drain
thehydraulicfluid atthedrain port until there are nobubbles inthe fluid.
8.1.2 Testing thehydraulic fluid supply
The axial piston unit should always have asufficient supply ofhydraulic fluid.
For this reason, thesupply ofhydraulic fluid must beensured atthestart
ofthecommissioning process.
When you test thehydraulic fluid supply, constantly monitor noise development and
check thehydraulic fluid level inthe reservoir. Iftheaxial piston unit becomes louder
(cavitation) ortheleakage fluid isdischarged with bubbles, this isanindication that
theaxial piston unit isnot being sufficiently supplied with hydraulic fluid.
For information ontroubleshooting, see chapter14 "Troubleshooting" onpage60.
To test thehydraulic fluid supply:
1. Allow thedrive motor torun atthelowest rotational speed. The axial piston unit
should beoperated without load. Pay attention toleaks and noises.
2. Check theaxial piston unit's drain line during thetest. The drain fluid should
bewithout bubbles.
3. Increase theload and check whether theworking pressure rises asexpected.
4. Perform aleak test toensure thehydraulic system issealed and can withstand
themax. pressure.
5. Check thesuction pressure atportS oftheaxial piston pump atnominal speed
and maximum swivel angle. Refer todatasheet 93100 for thepermissible value.
6. At maximum working pressure, check the case pressure at portL
1
, L
2
, L
3
, or L
4
and/or T
1
or T
2
. Refer todatasheet 93100 for thepermissible value.
8.1.3 Performing afunctional test
WARNING
Improperly connected axial piston unit!
Mixing up theports will cause malfunctions (e.g. lift instead oflower) and could
endanger personnel and equipment!
▶ Before thefunctional test, check whether thepiping specified inthe
hydrauliccircuit diagram has been installed.
Once you have tested thehydraulic fluid supply, perform afunctional test
ofthemachine/system. The functional test should beperformed according tothe
instructions ofthemachine/system manufacturer.
The axial piston unit istested for functional capability and performance before
delivery according tothe technical data. During commissioning, make sure theaxial
piston unit was installed inthe machine/system as intended.
▶ After starting thedrive motor, check inparticular thespecified pressures,
e.g.working pressure and case pressure.
▶ Perform aleak test without and with load prior tonormal operation.
▶ If necessary, disconnect thepressure gauge and plug theports with thespecified
threaded plugs.