Multi Pro 5800 Hydraulic SystemPage 5 − 45
Steering/Boom Lift Circuit − Steering Control Valve
and Steering Cylinder Test
The steering cylinder internal leakage test should be
performed if a steering problem is identified. This test
will determine if the steering cylinder is faulty.
NOTE: Steering cylinder operation will be affected by
incorrect tire pressure, binding of the hydraulic steering
cylinder, excessive weight on the vehicle and/or binding
of the steering assembly (e.g. wheel spindles, tie rods).
Make sure that these items are checked before pro-
ceeding with any hydraulic testing procedure.
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes.
2. Perform the steering/boom lift circuit − gear pump P2
flow and circuit relief pressure test to make sure that re-
lief valve and gear pump are functioning correctly (see
test procedure in this chapter).
3. Park machine on a level surface with the spray sys-
tem turned Off.
4. With the engine running, turn the steering wheel to
the right (clockwise) until the steering cylinder rod is fully
retracted.
5. Turn engine Off and engage the parking brake.
6. Read Precautions for Hydraulic Testing at the begin-
ning of this section.
7. Place a drain pan under the steering cylinder. Clean
and remove hydraulic hose from the fitting on the barrel
end of the steering cylinder. Plug the end of the discon-
nected hose with a steel plug.
8. Remove all hydraulic oil from drain pan and place the
empty drain pan under the open fitting of the steering
cylinder.
WARNING
Keep body and hands away from disconnected
hoses and fittings that might eject hydraulic fluid
under high pressure. Use paper or cardboard,
not hands, to search for leaks. Hydraulic fluid es-
caping under pressure can have sufficient force
to penetrate the skin and cause serious injury. If
fluid is injected into the skin, it must be surgically
removed within a few hours by a doctor familiar
with this type of injury. Gangrene may result from
such an injury.
IMPORTANT: Do not turn steering wheel to the left
(counterclockwise) as system damage may occur.
9. With the engine Off, continue turning the steering
wheel to the right (clockwise) with the steering cylinder
fully retracted. Observe the open fitting on the steering
cylinder as the steering wheel is turned. If oil comes out
of the open fitting while turning the steering wheel to the
right, the steering cylinder has internal leakage and
should be inspected and repaired as necessary (see
Steering Cylinder and Steering Cylinder Service in the
Service and Repairs section of this chapter). Check
drain pan for any evidence of oil that would indicate cyl-
inder leakage.
10.If steering problem exists and the steering cylinder
and steering/boom lift circuit − gear pump P2 flow and
circuit relief pressure tested acceptably, the steering
control valve requires service (see Steering Control
Valve Service in this chapter).
11.After testing is complete, remove plug from the dis-
connected hydraulic hose. Reconnect hose to the steer-
ing cylinder.
12.Start engine and run at low idle speed. Check for hy-
draulic leakage and correct before returning machine to
service.
Hydraulic
System
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