TM 5-3895-382-24
Steering Control Unit Drive Timing
Steering Control Unit Dive Timing.
(1) Cross pin. (2) Rotor tooth used for alignment. (3) Rotor. (4)
Stator.
Cross pin (1) must align with the bottom of rotor tooth (2).
Pump Efficiency Check
For any pump test at a given rpm, the pump flow at 690 kPa
(100 psi) will be larger than the pump flow at 6900 kPa (1000
psi). The difference between the pump flow of the two
operating pressures is the flow loss.
Method for finding flow loss:
Pump flow at 100 psi .................................... 57.5 gpm (liter/min)*
Pump flow at 1000 psi .................................-52.0 gpm (liter/min)*
Flow loss ............................................................5.5 gpm (liter/min)*
Flow loss when expressed as a percent of pump flow is used
as a measure of pump performance.
Example of finding percent of flow loss:
gpm flow loss
Pump flow @ 100 psi
X 100 =
Percent of
flow loss
*5.5
or
*57.5
X 100 = 9.5%
If the percent of flow loss is more than 10%, pump
performance is not good enough.
*Numbers in examples are for illustration and are not values for
any specific pump or pump condition. See Specifications for
pump flow of a new pump at 690 kPa (100 psi) and 6900 kPa
(1000 psi).
If the test bench can be run at 6900 kPa (1000 psi) and at full
pump rpm, find the percent of flow loss using Formula I.
If the test bench cannot be run at 6900 kPa (1000 psi) and at
full pump rpm, run the pump shaft at 1000 rpm. Measure the
pump flow at 690 kPa (100 psi) and at 6900 kPa (1000 psi).
Use these values in the top par of Formula II. For the bottom
part of the formula, run the pump shaft at 2000 rpm. Measure
the pump flow at 690 kPa (100 psi).
Formula 2:
gpm @ 100 psi - gpm @ 1000 psi
gpm @ 100 psi @ 2000 rpm
X 100 =
Percent of
flow loss
System Pressure Check
Make
reference
to
WARNING
on
first
page
of
Troubleshooting.
Tools Needed
4C4892
ORFS Fittings Group
1
Frame Lock Pin Installed.
(1) Lock pin. (2) Yoke.
1. Apply the parking brake.
14-15
