HYDRAULIC SYSTEM
CD5515-2/YB5515-2 SERVICE MANUAL
4-16
Published 1-20-2017, Control# 483-02
Pump Margin Pressure Setting
1.
With the engine shut off, install a 0 - 344.73 bar (0-5000
psi) pressure gauge on the test port G1 (1, Figure 4-6).
2.
Start engine and read the pressure gauge while at
engine idle. A reading of 24.13 ± 0.35 bar (350 ± 5 psi)
should be observed.
3.
If pressure reading is correct, shut off the engine, and
disconnect the pressure gauge.
4.
If pressure is incorrect, loosen the margin set screw from
the pump compensator valve (4, Figure 4-7). A 4 mm
hex wrench is required for the set screw.
5.
Adjust the margin pressure setting by turning the margin
adjusting screw (1, Figure 4-7) until 24.13 ± 0.35 bar
(350 ± 5 psi) pressure is obtained on the gauge;
clockwise increases pressure, counterclockwise
reduces the pressure. A 6 mm hex wrench is required for
the adjusting screw.
6.
Tighten the margin set screw.
7.
Shut off the engine and disconnect the pressure gauge.
Pump Compensator Pressure Setting
The pump compensator pressure is the main hydraulic
system pressure. It is regulated by a pressure compensating
valve located on the main hydraulic pump.
NOTE:
Always set the pressures on the pump
compensator and load sense relief valves together.
1.
With the engine shut off, install a 0 - 344.73 bar (0-5000
psi) pressure gauge on the test port (1, Figure 4-6).
2.
On the control valve, remove the cap on the load sense
relief valve (1, Figure 4-8) and turn the adjusting screw
fully in. A 19 mm open end wrench is required for the jam
nut and a 3 mm wrench is required for the adjusting
screw.
FIGURE 4-5
1
2
3
5
4
FIGURE 4-6
1
2
4
3
FIGURE 4-7
1
2
3
4
5
Reference Only
