DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
Charge pump - Pressure test (A.10.A.21 - F.40.A.30)
435, 445, 445CT
Testing the low-pressure charge system is safer and usually more informative than going into the high-pressure
test ports. To obtain as much system information as possible, charge pressure readings must be taken in neutral
as well as working the system in both the forward and reverse directions.
With the system in neutral, only charge pressure is present in the closed loop. At this time, the leakage from the
system is the least and the charge pressure is the highest. As the system is pressurized, the leakage from the
system will increase and the charge pump
fl
ow will make up for this leakage. With more of the charge pump oil
fl
owing to the closed loop, less oil will
fl
ow across the charge pressure relief valve, and therefore the pressure will
be slightly less. If the leakage from the system is excessive, the charge pressure will drop off more. This slight
drop in charge pressure between the system in neutral and with the system under load indicates the condition
of the closed loop system components.
1.
Raise and securely block the unit off the ground.
2.
Remove the brake assist line from the tee
fi
tting at
the T port (1) of the brake valve (3).
BD03F001_1
1
3.
Remove the cap from the tee
fi
tting on the P port
(2) of the brake valve (3).
4.
Connect the removed brake assist line to the tee
fi
tting on the P port (2) of the brake valve (3).
5.
Cap the tee
fi
tting on the T port (1) of the brake
valve (3).
6.
Remove the brake release line from the tee
fi
tting
that connects to the C2 port (4) of the brake valve
(3).
BD03F001_2
2
7.
Cap the tee
fi
tting that connects to the C2 port (4) of
the brake valve (3).
8.
Connect a 4,137 kPa (41 bar) (600 psi) pressure
gauge to the charge pressure test port.
A. For units without high
fl
ow, remove the cap
from the tee
fi
tting and install a 4,137 kPa(600 psi)
pressure gauge.
B. For units with high
fl
ow, remove the hose from the
tee
fi
tting and install a 4,137 kPa(600 psi) pressure
gauge.
1 04/05/2005
A.10.A / 49
Summary of Contents for 435
Page 1: ...REPAIR MANUAL 435 445CT 445 6 75491 1 04 05 2005 ...
Page 3: ...INTRODUCTION 6 75491 1 04 05 2005 1 ...
Page 15: ...INTRODUCTION bs04e020_1 4 6 75491 1 04 05 2005 13 ...
Page 16: ...INTRODUCTION bs04e021_1 5 6 75491 1 04 05 2005 14 ...
Page 19: ...REPAIR MANUAL DISTRIBUTION SYSTEMS 435 445CT 445 39702 1 04 05 2005 A ...
Page 86: ...39703 1 04 05 2005 A 10 A 66 ...
Page 104: ...39704 1 04 05 2005 A 12 A 18 ...
Page 126: ...39705 1 04 05 2005 A 16 A 22 ...
Page 127: ...DISTRIBUTION SYSTEMS A ELECTRICAL POWER SYSTEM 30 A 435 445CT 445 39706 1 04 05 2005 A 30 A 1 ...
Page 237: ...DISTRIBUTION SYSTEMS A LIGHTING SYSTEM 40 A 435 445CT 445 39707 1 04 05 2005 A 40 A 1 ...
