Test 004: Testing Horsepower Control - jcb JS300 Service Manual

A
Fig 5. View from Underside of Hydraulic Pump
Check the horsepower control by measuring the
Proportional Solenoid Valve (PSV) output pressure at
Function
No service selected in H power band
No service selected in G2 power band
Function
No service selected in H power band
No service selected in G2 power band
To achieve the above values the following conditions have
to be met:
1 Feed pressure in port "P" of the solenoid to be 44 bar.
2 Back pressure to be no more than 10 bar.
3 Oil temperature to be 55 °C +/- 10 °C.
E-255

Test 004: Testing Horsepower Control

A407830 -C1
Table 15. JS300, JS330
Expected PSV Pressure
9.32 bar
18.55 bar
Table 16. JS370
Expected PSV Pressure
10.5 bar
19.33 bar
9813/5100-1
Section E - Hydraulics
Hydraulic System Fault Finding
Test 004: Testing Horsepower Control
selected electrical power settings for the solenoid coil.
Proceed as follows:
1 Fit gauge 0 - 60 bar (0 -1000 lb/in
solenoid secondary pressure measurement port A
using suitable adaptor (port thread is 1/4 BSP O-ring
fitting).
2 Select the machine status screen on the display
monitor. Select the hydraulic pump current value.
3 Warm up machine hydraulic temperature to 50 °C
(122 °F)
4 The current value in mA is proportional to the engine
rpm. The expected current for the full range of engine
speeds can be seen on the power band mapping
tables for the applicable machine model. Refer to
Section C - Engine Throttle and Power Mode
Control.
Expected Current (mA)
550 mA
434 mA
Expected Current (mA)
536 mA
425mA
2 ) into proportional
E-255