jcb JS200 Service Manual page 251

Section E
20 - 4
Specifications, (continued)
Proportional Pressure Reducing Valve Specifications (Reference)
1. Specifications
(1) Max. primary pressure
(2) Max, back pressure (allowable pressure)
(3) Secondary pressure setting range
(4) Max. flow rate
(5) Electrical specifications
1 Rated current
2 Coil resistance (at 20°C)
*
3 Recommended fluctuation of
proportional solenoid current
2. Hydraulic symbol
* Checking the Proportional Solenoid Current
* Service Procedure
* Method 1
*
Refer to Self Test, Self Test Function, Pump Input Amperage.
Method 2
*
* 1 Switch engine off.
2 Pull apart bullet connector on any of the two wires leading from the Proportional Solenoid on the Hydraulic Pump.
*
Note: Depending on which wire is disconnected will determine the polarity of the current reading.
*
* 3 Insert an appropriate Multimeter in series between the bullet connector and the wire that has been disconnected.
4 Ensure that the Multimeter is scaled to mAmps not Amps.
*
5 Switch engine on to maximum revs.
*
6 Measure the current at the Proportional Solenoid.
*
9803/6400
Hydraulics
Regulator JS200. JS240
40 kgf/cm
2
10 kgf/cm
2
0-40 kgf/cm (at primary press.=40 kgf/cm
6 l/min
800 mA
*
13.5 ± 0.7
70 ~ 75 Hz, 400 ~ 600 mApp
Section E
20 - 4
)
2
Issue 2*