TM 5-3805-263-14&P-3
HYDRAULIC SYSTEM AND STEERING
TESTING AND ADJUSTING
A visual inspection of the hydraulic system and its
move in either direction from stop to stop is - 3.5 + .5
components is the first step when making a diagnosis of
seconds.
a problem.
If it takes too much time for a cylinder rod to move
Before making any tests, visually inspect the
in either direction, make a record of the time and the
complete hydraulic system by looking for leakage of oil
direction *.
and for parts that have damage.
A stop watch or timer is used when making the first
Blade Side Shift
tests. The first tests are used to find the circuit or circuits
The blade will move from stop to stop in either
in the hydraulic system that need adjust- ment or a repair
direction in approximately the same time. The time is 10
of components. The 9S2000 Flow Meter and the FLOW
I seconds.
METER TEST PROCEDURE IX can be used to find the
If it takes too much time for the blade to move in
component in the circuit that needs the adjustment or
either direction, make a record of the time and the
repair.
direction *.
Remove the filter elements and cut them apart.
Blade Center Shift
Look for-particles in the cut elements; pieces of dirt,
The movement of the rod, either into or out of the
rubber, cork and metal. A magnet will separate the iron
hydraulic cylinder, moves the drawbar either to the left or
or steel particles from the bronze and aluminum metal
to the right. The time for the rod to move from the
pieces.
extended rod position into the cylinder, or from the
Clean the strainer and install new filter elements.
retracted rod position to the rod extended position, is 5.5
Fill the hydraulic tank to the mark on the gauge before
.5 seconds.
starting the engine. Start the engine and operate the
components in the hydraulic system until the
If it takes too much time for the rod to move either into or
temperature of the oil is between 30 and 65 F (170 and
out of the hydraulic cylinder, make a record of the time
35 C) more than the temperature of the atmosphere.
and the direction *.
WARNING: When testing and adjusting the
Blade Lift
! hydraulic system, move the machine to a
Both rods go into the hydraulic cylinders to lift the
smooth horizontal location. Move away from
blade. It may not be easy to move both control levers to
working machines and personnel. There must be only
BLADE LIFT positions at the same time and both
one operator. Keep all other personnel away from the
cylinders may not start and stop at the same time. The
machine or where the operator can see the personnel.
movement of one rod in a hydraulic cylinder, must not be
more than .5 second different than the movement of the
TESTS FOR SYSTEMS OPERATION (TIME)
other rod. When the blade is on the ground, the time for
With the hydraulic oil heated, run the engine at high idle
the movement of the rods into the hydraulic cylinder to lift
rpm. The lock pin must be in the center hole and the
the blade until it stops is 4.5 + .5 seconds.
blade should be near the ground when the time for the
If it takes too much time for either or both rods to
movements of the cylinder rods are made.
move into the cylinders, make a record of the time or
Wheel Lean
times for the rods to move *.
The wheel lean from left to right, takes a little less time
Blade Tip
than from right to left. When the front wheel lean moves
The rods of the hydraulic cylinders that tip the
from full right to full left, the rod moves into the hydraulic
blade move out of the cylinders in a little less time than it
cylinder in 2.5 + .5 seconds. If it takes too much time for
takes for the rods to move into the cylinders. The
the cylinder rod to move in either direction, make a
average time for the rods of the cylinders to tip the blade
record of the time and the direction *.
is 3 + .5 seconds.
Articulation
If it takes too much time for the rods to move either
There is no difference in time for the frame to move from
into or out of the cylinders, make a record of the time and
full right to full left, or full left to full right (articulation).
the direction of the rods *.
The time for the frame to
3-20
