Specifications

Service Training
Page 13
Section 4.5
4.5.7 PRESSURE DIFFERENCE DP
TEST REQUIREMENTS
- Truck blocked up.
- Engine and travel hydraulics at operating temperature.
- Pedal adjustment is in order.
- Symmetry of travel control is in order.
- Two low pressure gauges connected to ports Y and Z of travel control unit with screw couplings 1.1 (refer
to "Aids and Tools for Measurements").
TEST
Test Symptoms Assessment
Start the engine. Dp between ports Y and Z Adjustment of pressure
Release the brake. rises to 11
+0.1
bar. relief valve (34) in order.
Alternately depress forward
and reverse pedal as far as Dp between ports Y and Z Adjustment of pressure
possible. does not rise to 11
+0.1
bar relief valve (34) not in
or is larger. order.
Adjust as follows:
- Slacken locknut (7) at pressure relief valve (34).
- If Dp was too large, turn screw (8) out.
- If Dp was too small, turn screw (8) in.
- Repeat the test.
- Tighten locknut (7).
If an adjustment is not possible, the travel control unit should be repaired or replaced.
09.96