Avant Tecno Oy Avant 850, Operator'S Manual

Page: 120 / 138

Service and maintenance Avant 850
120
WARNING
Risk of injection of hydraulic oil
- Wrong handling of the
hydraulic system or wrong tools
can cause ejection of hydraulic
oil. It is recommended that
pressures should only be checked
or adjusted by a competent and
experienced technician. Contact
your AVANT dealer if you need
assistance.
Pressure measurement from multiconnector
To measure the pressure of the auxiliary hydraulics,
it recommended to use the pressure gauge adapter
A422475.
Boom control valve pressure
There are two pressure relief valves at the main
control valve of the boom and auxiliary hydraulics.
The auxiliary hydraulics pressure can be measured
from the multiconnector, but the boom pressure must
be measured from the valve assembly with a
pressure gauge that has a measurement fitting.
Contact Avant service for measurement and
adjustment.
1. Auxiliary hydraulics pressure relief valve
2. Boom hydraulics pressure relief valve
3. Boom pressure measurement fitting
Never adjust pressure to higher
level than recommended setting.
The electric drive system is
designed to operate at the
intended pressure level. Other
settings can damage electric drive,
modify the response of the
controls, and decrease battery life.
Warranty will not cover for
damages caused by wrong
pressure setting. Never remove
tamper resistant seals from
pressure relief valves.
Drive pressure check
Drive pressure should be checked only by qualified
service technicians. If you suspect that the pulling
force of the loader has decreased contact your
nearest Avant service. There are two pressure relief
cartridges which have fixed pressure setting. Also
the power control valve, the hydraulic drive motors,
drive pump feed pressure, and brake release
pressure should be checked when investigating drive
system related troubles.
The drive pressure can be checked only with a
pressure gauge connected to the drive pump valve
block. A pressure gauge with a minimum range of up
to 400 bar is needed. The setting of the fixed
pressure relief cartridges can not be adjusted.
Drive pressure check is
recommended only for
experienced service professionals.
Special instruments are required.