All Functions Inoperative, Engine Starts And Runs - Engine Models; All Functions Inoperative, Pump Motor Runs - Dc Powered Models - JLG T350 Troubleshooting Manual

SECTION 1 - TROUBLESHOOTING BY FUNCTION

1.3 ALL FUNCTIONS INOPERATIVE, ENGINE STARTS AND RUNS - ENGINE MODELS

Step Pretest Instructions
1.3.1
1.3.2
1.3.3
1.3.4 Connect a 0-5000 PSI pres-
sure gauge at the manifold "G"
port
1.3.5 Plumb a 0 to 5000 PSI (345
bar) pressure gauge into the
manifold P port

1.4 ALL FUNCTIONS INOPERATIVE, PUMP MOTOR RUNS - DC POWERED MODELS

Step Pretest Instructions
1.4.1
1.4.2
1.4.3 Connect a 0-5000 PSI pres-
sure gauge at the manifold "G"
port
1.4.4 Plumb a 0 to 5000 PSI (345
bar) pressure gauge into the
manifold P port
1-30
Test
Basic check of likely causes
Try both ground and platform
controls
Is the hydraulic pump turning
with the engine?
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
Basic check of likely causes
Try both ground and platform
controls
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)?
T350 T500J
Result
One set of controls functions
Both sets of control inoperable
Yes
No
Yes
No
Yes
No
Result
One set of controls functions
Both sets of control inoperable
Yes
No
Yes
No
Corrective Action
Possible Causes: 4.1.68
See 1.10 Ground Controls Inoperative or
1.11 Platform Controls Inoperative
Go to step 1.3.3
Go to step 1.3.4
Perform component check: 3.6 Engine
Powered Machine - Hydraulic Pump
Possible Causes: 4.1.37, 4.1.47
Go to step 1.3.5
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
Possible Causes: 4.1.68
See 1.10 Ground Controls Inoperative or
1.11 Platform Controls Inoperative
Go to step 1.4.3
Possible Causes: 4.1.37, 4.1.47
Go to step 1.4.4
Possible Causes: 4.1.40, 4.1.10, 4.1.47
Possible Causes: 4.1.37, 4.1.45, 4.1.39
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