CAUTION: Immediately after stopping the diesel engine,
remove the Blocking Plate Assembly from the return line
on the control valve. This will prevent any possible
PROBLEM: The percent of flow loss for Test 15 is
10% or MORE. Flow differential for Test 15 is 2 gpm
or MORE than flow differential for Test 17. Tests 18
through 25 have the same flow differential.
Oil aeration (low oil level, hydraulic oil that is not the
correct type, air leak in the suction line for the pump, oil
leaks in the tank such as failure of seals, loose
connections or pump cartridge is not installed correctly in
RECOMMENDATION FOR ACTION:
A. Check oil level and type of hydraulic oil being
B. Check suction line for air leaks [Put foam (like
shaving cream) on all connections. The foam
will be pulled into the line at any point of
C. Remove cover from hydraulic tank and inspect
for oil leak (check above the oil level first).
D. Disassemble pump and check for correct
PROBLEM: Flow differential between each of the
Tests 18 through 25 suddenly becomes
lower at one test and the flow rate is
the same for the remainder of the tests
Example: 8 gpm differential between
Tests 18 and 19. 19 and 20, 20 and 21,
but 1 gpm differential between 21 and
22 and flow rates for Tests 23, 24 and
25 are the same as 22.
Pump cavitation (restriction in the suction line for the
RECOMMENDATION FOR ACTION:
Inspect suction line and tank.
BLOCKED CYLINDER TESTS (CHART C) If the
System Tests and Pump Test give an indication of
cylinders that is not acceptable, do the Blocked Cylinder
Blocking Plate Assemblies or Caps and Plugs can
be put in each of the cylinder lines. For best accuracy,
do these tests with the oil temperature approximately
150° F (near the oil temperature for the System Tests
and Pump Test).
WARNING: Install the safety link. Lower all
implements to the ground. Move the steering wheel from
RIGHT TURN to LEFT TURN several times to release
any pressure oil in the cylinder lines. All pressure in the
lines must be released or injury to personnel and
damage to equipment can result while loosening the
lines to install or remove the plate assemblies.
All Cylinders Blocked
1. Put control levers in HOLD position.
2. Open the manual load valve fully.
3. Start the diesel engine.
Test 26: System Oil Temperature
1. Turn the steering wheel to the RIGHT TURN
2. Run the engine at any rpm with the system
pressure at 0 to 100 psi,
3. Write down the oil temperature.
Test 27 and 28: Leakage Rates
These two tests are similar. Do the tests as follows:
1. With the manual load valve fully open, turn the
steering wheel to the RIGHT TURN position.
2. Run the engine at test rpm.
3. Slowly close the manual load valve to get 1000
4. Write down the flow rate (gpm).
5. Do this procedure again in the LEFT TURN
Test 33: System Oil Temperature
1. Turn the steering wheel to the RIGHT TURN position.