Inspection, Maintenance and Adjustment
4-103
DL550-5
HYDRAULIC PRESSURE
CHECKS
Steering Pump Load Sensing Pressure
1. Attach gauge to port.
2. Adjust relief valve cartridge on amplifier (Figure 153).
Cartridge must be adjusted to open at:ï€
189 +5 kg/cm
2
(185 +5 bar (2,683 +73 psi)).
3. Unscrew remove plug and washer. Adjust sc
rew that is
beneath plug. Turn screw clockwise to raise relief
pressure. Turn screw counterclockwise to lower relief
pressure. One turn varies 65 kg/cm
2
(64 bar (925 psi)).
4. Install plug and washer after pressure has been adjusted.
Pilot Supply Pressure
1. Attach gauge to port.
2. Adjust relief cartridge (Figure 154) on brake and pilot and
fan motor supply valve. Pressure must be set
at:ï€
31 ±2 kg/cm
2
(30 ±2 bar (435 ±29 psi)).
3. Loosen locknut on adjusting screw. Turn adjusting screw
cloc
kwise to raise relief pressure. Turn adjusting screw
counterclockwise to lower relief pressure.
4. Tighten locknut after adjustment.
5. If the pressure doesn't change, the maximum current value
of pu
mp control must be changed by DMS.
Reference
Number
Description Pressure
1
Steer Pump Load Sensing Pressure
(TPSLS)
At relief: 189 +5 kg/cm
2
(185 +5 bar (2,683 +73 psi))
At idle: 5 ±5 kg/cm
2
(5 ±5 bar (73 ±73 psi))
2 Pilot Supply Pressure (TP)
31 ±2 kg/cm
2
(30 ±2 bar (435 ±29 psi))
3 Main Pump Pressure (TPM)
At relief: 280 ±10 kg/cm
2
(275 ±10 bar (3,989 ±145 psi))
At idle: 20 ±5 kg/cm
2
(20 ±5 bar (290 ±73 psi))
4 Brake Charging Pressure (G)
102 ~ 163 kg/cm
2
(100 ~ 160 bar (1,450 ~ 2,321 psi))
5 Steer Pump Pressu
re (TPS)
At relief: 280 ±10 kg/cm
2
(275 ±10 bar (3,989 ±145 psi))
At idle: 25 ±5
kg/cm
2
(25 ±5 bar (363 ±73 psi))
6 Transmission Clutch Pressure (TM)
16 ~ 18 kg/cm
2
(16 ~ 18 bar (232 ~ 261 psi))
7
Main Pump Load Sensing Pressure
(TPM
LS)
At relief: 280 ±10 kg/cm
2
(275 ±10 bar (3,989 ±145 psi))
At idle: 0 ±5 kg/cm
2
(0 ±5 bar (0 ±73 psi))
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