Service Training
Page 4.2
Section 82
09.04
CHECKING Q
MIN
- Shut off the engine, lock the left wheel, close the valve on 1.32 and put a 5-mm spacer between injection
pump lever and stop screw for maximum engine speed.
- Start the engine, fully depress an accelerator pedal (engine speed reaches approx. 1200 rpm) and
measure the speed of the right wheel.
- Now open the valve on 1.32 and measure the wheel speed again (hydraulic motor now goes from Q
max
to Q
min
). When the valve is open, the wheel speed must be higher by a factor of 2.62 than when the valve
is closed.
Example:
Wheel speed Required speed
with valve close x factor = at Q
min
with valve open
60 rpm x 2,62 = 157 rpm
The required speed can be adjusted with the stop screw (4).
Tolerance range + 0 / - 10 rpm.
Turning screw in = decreases rpm
Turning screw out = increases rpm
In the secondary control the engine speed is a little lower, depending on the operating temperature of the
engine and the travel drive. For this reason the wheel speed will be near the lower tolerance limit.
- Perform the same test with the right wheel locked.
- After checking the primary and secondary control, make the truck operational again and trial drive the
truck.
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