Section 1 - Troubleshooting By Function; All Functions Inoperative; Pump Motor Will Not Operate - Dc Powered Models - JLG T350 Troubleshooting Manual

1.1 ALL FUNCTIONS INOPERATIVE

Step Pretest Instructions
1.1.1
1.1.2
1.1.3
1.1.4
1.1.5 Connect a 0-5000 PSI pres-
sure gauge at the manifold "G"
port
1.1.6 Plumb a 0 to 5000 PSI (345
bar) pressure gauge into the
manifold P port

1.2 PUMP MOTOR WILL NOT OPERATE - DC POWERED MODELS

Step Pretest Instructions
1.2.1
1.2.2 Engage enable and lift up
switch
1.2.3 Engage enable and lift up
switch
1.2.4 Engage enable and lift up
switch
1.2.5 Engage enable and lift up
switch
3121203
SECTION 1. TROUBLESHOOTING BY FUNCTION
Test
Basic check of likely causes
Do panel indicator lights blink
at power-on?
Try both ground and platform
controls
Is the hydraulic pump motor
running while activating a func-
tion?
While holding enable and lift up
switch, does pressure rise
above 100PSI (minimum func-
tion pressure)?
While holding enable and lift up
switch, does pressure rise
above 100PSI (minimum func-
tion pressure)?
Test
Voltage between B+ and B-
(X102 and X101) =Vbatt?
Voltage between M1 and M2
(X103 and X104) =Vbatt?
Voltage between X115 and
X114=Vbatt?
Voltage between X115 and
X101 =Vbatt?
Voltage between X114 and
X102 =Vbatt?
T350 T500J

SECTION 1 - TROUBLESHOOTING BY FUNCTION

Result
Yes
No
One set of controls functions
Both sets of control inoperable
Yes
No
Yes
No
Yes
No
Result
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Corrective Action
Possible Causes: 4.1.66, 4.1.67, 4.1.68
Go to step 1.1.3
Ground controller not powered. Perform
component check: 3.2 DC Powered
Machine - Power or 3.7 Engine Powered
Machine - Power
See 1.10 Ground Controls Inoperative or
1.11 Platform Controls Inoperative
Go to step 1.1.4
Go to step 1.1.5
Perform component check: 3.1 DC
Powered Machine - Hydraulic Pump or
3.6 Engine Powered Machine - Hydrau-
lic Pump
Possible Causes: 4.1.37, 4.1.47
Go to step 1.1.6
Possible Causes: 4.1.40, 4.1.10, 4.1.47
Possible Causes: 4.1.37, 4.1.45, 4.1.74,
4.1.75, 4.1.39
Corrective Action
Go to step 1.2.2
See 3.2 DC Powered Machine - Power
Go to step 1.2.3
Possible Causes: 4.1.12
Possible Causes: 4.1.69
Go to step 1.2.4
Go to step 1.2.5
Possible Causes: 4.1.70, 4.1.72, 4.1.12
Possible Causes: 4.1.12
Possible Causes: 4.1.71, 4.1.72, 4.1.12
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