Relief Valve - Flow Test (H.40.B.16 - F.40.A.45); 435, 445, 445Ct - Case 445CT Repair Manual

Relief valve - Flow test (H.40.B.16 - F.40.A.45)

435, 445, 445CT

Prior operation: Relief valve - Flow test (A.10.A.16 - F.40.A.45)
1. Start the engine and run the engine at 2300 r/min
(rpm).
2. Hold the lift control lever in the LIFT position 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 9.
3. Hold the lift control lever in the LOWER position 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 10.
NOTE: Understanding the results of the tests are outlined
in the steps below.
4. Refer to Hydraulic pump - Flow test (A.10.A.20
- F.40.A.45) If the flow indication for a circuit was
approximately the same as the flow indication at the
same pressure in Test Number 1 of the Hydraulic
Pump Flow Test , the circuit is good.
5. If the flow indication for a circuit was more than
3.8 L/min (one gpm) less than the flow indication
at the same pressure in Hydraulic pump - Flow
test (A.10.A.20 - F.40.A.45) Test Number 1, there
is leakage in that circuit.
6. Leakage in the lift circuits can be caused by any of
the following problems:
A. Damaged or worn packing in one or both of the
lift cylinders.
B. Damaged or worn spool or spool bore in the
loader control valve.
C. Defective circuit relief valves.
D. Inadequate control spool travel.
7. If the flow indication for every circuit tested was
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 valve or seals.
WORKING ARM - SINGLE ARM Lift
1 04/05/2005
H.40.B / 36