TM 5-3805-291-23-1
THEORY OF OPERATION - CONTINUED
0003 00
ELECTRO-HYDRAULIC SYSTEM - CONTINUED
Table 9. ECM Pin Terminal and Corresponding Description
for Main Control Valve Pilot Proportioning Solenoids.
Pin
Description
J1-48
Raise Solenoid
J1-49
Lower Solenoid
J1-50
Return for Lift and Tilt
Solenoids
J1-51
Rack Back Solenoid
J1-52
Dump Solenoid
J1-58
Auxiliary "HE" Solenoid
J1-59
Auxiliary "RE" Solenoid
J1-60
Return for Auxiliary Solenoid
(3)
Table 10 shows relationship between current going to solenoid and output pressure that results. As current
increases, pilot pressure increases. A pressure value outside of upper and lower limits indicates there is a
problem in hydraulic system. Pilot pressure can be monitored by attaching a pressure gage to main control
valve end caps.
Table 10. Output Envelope.
Current (Amp)
Lower (psi-kPa)
Mean (psi-kPa)
Upper (psi-kPa)
0
0
0
3.5 psi (25 kPa)
0.2
0
0
3.5 psi (25 kPa)
0.3
0
0
25 psi (170 kPa)
0.4
0
15 psi (100 kPa)
47 psi (325 kPa)
0.5
0
47 psi (325 kPa)
80 psi (550 kPa)
0.6
47 psi (325 kPa)
80 psi (550 kPa)
110 psi (775 kPa)
0.7
80 psi (550 kPa)
110 psi (775 kPa)
145 psi (1,000 kPa)
1.0
180 psi (1,225 kPa)
210 psi (1,450 kPa)
245 psi (1,675 kPa)
1.3
275 psi (1,900 kPa)
310 psi (2,125 kPa)
340 psi (2,350 kPa)
1.6
375 psi (2,575 kPa)
405 psi (2,800 kPa)
440 psi (3,025 kPa)
1.9
470 psi (3,250 kPa)
505 psi (3,475 kPa)
535 psi (3,700 kPa)
0003 00-157
