S0709665K
Page 8
Flow Amplifier (Danfoss)
STEERING SYSTEM WITH OSQA/B AND OSPBX-LS
Problem Possible Causes Remedies
Amplification too large Dirty, leaky or missing check valve (1). Clean or replace check valve.
Piston (2) sticks in the open position. Clean and check that the piston
moves easily.
Amplification too small Piston (2) sticks in the closed position. Clean and check that the piston
moves easily.
Piston (2) incorrectly installed (only
OSQA/B-5).
Rotate the piston 180˚ on its
axle.
Heavy turning of
steering wheel and
slow increase of
amplification
Dirty orifices (3) in directional valve. Clean or replace orifice.
Dirty orifices (4) in the combi-valve
spool.
Clean or replace orifice.
Dirty orifices (5) in housing. Clean or replace orifice.
Dirty orifices (6) in LS-port. Clean or replace orifice.
Dirty orifices in throttle/check valve (7) in
PP-port.
Clean or replace throttle/check
valve.
No end stop in one or
both directions.
One or both shock valves (8) set too low. Setting takes a long time without
special equipment. Contact the
nearest service shop.
One or both anti-cavitation valves (9)
leaky, or sticks.
Clean or replace completely
shock/anti-cavitation valve(s).
Missing end-stop plate(s) pos. 10 for
directional valve.
Fit end-stop plates.
"Hard" point when
starting to turn the
steering wheel
Air in LS and/or PP pipes. Bleed pipes.
Spring force in the built in priority valve
too weak (11).
Replace spring with one which is
more powerful. (There are three
sizes: 4, 7 and 10 bar).
Orifices in respectively LS-(6) or PP-(7)
ports blocked.
Take out and clean orifices.
No pressure build-up LS-pressure limitation valve (12)
adjusted too low.
Remove plug and set to
specified pressure.
Spool and sleeve in OSPBX steering
unit put together incorrectly.
Take out spool set and turn the
inner spool 180˚ in the outer
sleeve. (See service manual)
Emergency control ball in steering unit
missing.
Install new ball.
Pump does not run or is defective. Repair or replace pump.
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