STEERING SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
PISTON PUMP (STEERING) MARGIN PRESSURE TEST AND ADJUSTMENT - CONTINUED
WARN I N G
Injury or death to personnel can resultfrom escaping fluid under pressure.
Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and
cause serious injury and possible death. If fluid is injected into your skin, it must be treated immedi-
ately by a doctor familiar with this type of injury.
Always use a board or cardboard when checking for a leak.
Injury or death to personnel can result from machine articulation or movement.
Machine frames can move a d personnel can be crushed.
N OT E
During the following procedure, do not turn steering wheel once machine ceases to articulate. Once
machine ceases to articulate in one direction, immediately turn steering wheel in opposite direction. Make
sure to turn steering wheel at a constant rate. Pressure will vary with speed of rotation. Slower rotation will
cause lower pressure reading. Faster rotation will cause higher pressure reading.
With assistance, articulate machine to left or right. After machine ceases to articulate in one direction, immediately turn
steering wheel in opposite direction. Turn steering wheel at a uniform rate.
If margin pressure is not 350 ± 20 psi (2,400 ± 150 kPa), adjust flow compensator valve.
If steering pump pressure does not equal 3,050 ± 75 psi (20,865 ± 515 kPa), adjust pressure compensator valve.
N OT E
Margin pressure is the difference between steering pump pressure and signal pressure from steering meter-
Record pressure reading on pressure gage (12). This
reading is margin pressure.
Record reading on test stand. This reading is steering
With assistance, lower bucket and any attachment to
ground and stop engine (TM 5-3805-291-10).
Relieve hydraulic system pressure (TM 5-3805-291-
Remove hydraulic lines (8 and 9) from pressure taps
(1 and 10).
Remove test stand and pressure differential gage
group (7) from machine.