ASV SR-70 Wartungshandbuch PDF herunterladen (Seite 131)

Note: The charts pictured give the acceptable ranges

for fluid flow when loaded to the levels indicated. The

low flow values are to be understood as acceptable if

within 1 gpm (3.8 lpm) of the specified value. The high

flow values are acceptable if within 2 gpm (7.6 lpm) of

the specified value. (Oil at operating temperature)

To test flow:

1. Attach a flow meter to the quick couplers of the cir-

cuit to be tested. (high or low flow)

2. Start the machine, warm to operating temperature,

then activate the circuit with the engine operating

at 2600 RPM.

3. Record and compare your readings with those of

the charts on page 17-6 in both directions.

Flow Troubleshooting

If your readings differ from those listed on the charts,

identify the symptom you are experiencing in the list of

possible problems below and follow the steps to identi-

fy and correct the problem.

Problem 1:

Both high and low flow readings are less than

specified.

Possible causes:

1. Auxiliary relief valve pressure setting incorrectly

(see page 17-3)

2. Quick coupler block pressure release valve stuck in

down (release) position.

3. Auxiliary pump malfunctioning or faulty.

4. Engine RPM too low.

Problem 2:

High flow readings are less than specified (low

flow is within specification).

Possible causes:

1. Low charge pressure.

2. Control valve spool malfunction.

Note: Make sure that the high flow reading is greater

than the low flow reading. If they are equal, the prob-

lem is most likely electrical.

Problem 3:

Flow is within specifications in one direction, but

lower than specified in the other.

Possible causes:

1. Auxiliary line relief valve in need of replacement.

(see page 17-4 for test instructions and figure 17-8

for location)

2. Control valve spool malfunction.

Problem 4:

Low flow readings are less than specified (high

flow is within specification).

To correct:

1. Turn the adjustment screw on the pilot generation

block pressure reducing valve clockwise to increase

the flow within the low flow circuit until correct.

(see page 3-5, view D, item 5 to locate)

Problem 5:

Low flow readings are higher than specified (High

flow is within specification).

To correct:

1. Turn the adjustment screw on the pilot generation

block pressure reducing valve counter clockwise to

decrease the flow within the low flow circuit until

correct. (see page 3-5, view D, item 5 to locate)

Problem 6:

High and low flow functions only work in one

direction.

Possible causes:

1. Wire broken or disconnected at the pilot generation

block.

2. Solenoid coil malfunction. (see page 3-5)

3. Solenoid spool malfunction. (see page 3-5)

4. Faulty auxiliary hydraulic switch.

Problem 7:

Low flow works as intended when using the con-

tinuous switch, but does not work when using the

variable flow thumb switch.

Possible causes:

1. Variable flow fuse blown.

2. Power wire to variable flow switch broken or dis-

connected. (BU-16 see electrical schematic)

3. Variable flow switch malfunction.

4. If the switch works in one direction, but not the

other, check the pressure reducing proportional

valves and the wires that connect them to the

wiring harness for proper condition and function.

(see page 3-5, view B item 6, view D item 4)

17-7

Rubber Track Loader

17. Hydraulic Pressure & Flow

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