Case 445 - SECONDARY HYDRAULIC POWER SYSTEM - Flow Test (A.12.A - F.40.A.45); 435, 445, 445 Ct

DISTRIBUTION SYSTEMS - SECONDARY HYDR AULIC POWER SYSTEM
SECONDARY HYDRAULIC POWER SYSTEM - Flow test (A.12.A -
F.40.A.45)
435, 445, 445CT
Prior operation: Relief valve - Flow test (A.10.A.16 - F.40.A.45) Relief valve - Flow test (H.40.B.16 -
F.40.A .45)Relief valve - Flo w test (H.5 0.C.17 - F.40.A.45)
NOTE: Both of the loader control valve spools must be in the NEUTRAL position during the following test.
NOTE: If the auxiliary hydraulic circuit is connected to an atta chment using a hydraulic motor, this flow test does not
apply.
1. Push down one side o f th e au xilia ry h yd ra u lic flow
control pedal and adjust the pressure valve on the
flowmeter until the pressure gauge indicates 124
bar (1800 psi). Adjust the engine speed to keep the
engine running at 2300 r/min (rpm). Read the flow
gauge and record the reading as test number 11.
2. Push down th
e o p posite side of th e a ux iliary
hydraulic flow control pedal and adjust the pressure
valve o n the fl owmeter until the pressure gauge
indicates
124 bar (1800 psi). Adjust the engine
speedtokeeptheenginerunningat2300r/min
(rpm). Read the flow gauge and record the reading
as test num
ber 12.
3. Open the pressure valve completely. De c re ase the
engine sp
eed to low idle and stop the engine.
NOTE: Understanding the results of the tests are outlined
in the ste
ps below.
4. Refer to Hydraulic pump - Flow test (A.10.A.20
- F.40.A.45) If the flow indication for a circ uit was
approximately the same as the flow indication at the
same press ure in Test Number 1 of the Hydraulic
Pump Flow Te st , the circuit is good.
5. If the flow indication for a circuit was more than
3.8 L/min (on e gpm ) less than the flow indication
atthesamepressureinHydraulic pump - Flow
test (A.10.A.20 - F.40.A.45) Test Number 1, there
is leakage in that circuit.
6. Leakage in the auxiliary circuits can be caused by
any of the following problems:
A. Inadequate control spool travel.
B. Damaged or worn packing in one or both of the
cylinders.
C. Damaged or worn spool or spool bore in the
loader control valve.
7. If the flow indication for every circuit tested w as
more than 3.8 L/min (one gpm) less than the flow
indication at the same pressure in test number. 1,
there is leakage at a point common to the entire
system. A probable cause is a damaged or worn
main relief v alve or seals.
1 04/05/2005
A.12.A / 4