MASSEY FERGUSON 5400 - Page 613

Massey Ferguson 5400 - Issue 1.a
09K01.11
57 l/min Open Centre tests
Checking for leaks at clutch and slave
devices
To adjust reference flow rate Q4:
- all low pressure functions should be at neutral;
- the front axle should be engaged (clutch not
supplied, indicator light on);
- the range lever should be in Tortoise position (icon);
- the reverse shuttle control should be in neutral posi-
tion (letter N on instrument panel);
- Speedshift should be in D range;
- the differential lock should be disengaged (indicator
light on);
- the power take-off should be disengaged (indicator
light out).
Check (Fig. 9 or Fig. 10)
The flowmeter can be connected:
- either to the cooler outlet (Fig. 9);
- or where the pipe joins the hoses on the right-hand
side of the tractor (Fig. 10).
- The flowmeter should be connect using locally made
unions.
- Connect the flowmeter as is convenient (see
previous remark).
I
MPORTANT: Check that the flowmeter load valve
remains fully open throughout the test.
- Connect a pressure gauge set to approximately 30
bar to the low pressure connector (1) (Fig. 8).
- Note the Q4 reference flow rate at 1000 rpm.
- Activate each function separately and note the Q5
flow rate.
- The difference Q4 - Q5 represents the leak
detected.
The value read should not exceed the values indi-
cated in the “Identifying leaks at clutch and slave
devices” table below.
Examples of the test on the clutch and PTO.
• Example 1
Q4 = 15 l/min Q5 = 14.5 l/min
leak detected = 0.5 l/min
Conclusion: Test OK
• Example 2
Q4 = 15 l/min Q5 = 13 l/min
leak detected = 2 l/min
Conclusion: Leak exceeds allowable value
- Before checking the following function and to avoid
misreading the Q5 flow rate, bring the control of that
element back to the neutral position or to the above
neutral positions.
N
OTE: When all clutch and slave devices are acti-
vated, the low pressure P4 should remain at 18 ± 1
bar
.
The leaks in the single control systems can be
detected according to the values in the table.
N
OTE: For the differential lock function, an additional
test is necessary to determine the difference
between the front and rear.
Checking method
- Disconnect and block one of the piston supplies.
- Check if the leak persists.