Telescope Out Function Inoperative; Telescope In Function Inoperative - JLG T350 Troubleshooting Manual

SECTION 1 - TROUBLESHOOTING BY FUNCTION

1.15 TELESCOPE OUT FUNCTION INOPERATIVE

Step Pretest Instructions
1.15.1
1.15.2 Engage enable and telescope
out switch
1.15.3 Install a 0 to 5000 PSI (345 bar)
pressure gauge at the manifold
G port
1.15.4 Plumb a 0 to 5000 PSI (345
bar) pressure gauge into the
manifold P port
1.15.5 Plumb a 0 to 5000 PSI (345
bar) pressure gauge into the
hose from the lift up cylinder
cap end.

1.16 TELESCOPE IN FUNCTION INOPERATIVE

Step Pretest Instructions
1.16.1
1.16.2 Engage enable and telescope
in switch
1.16.3 Install a 0 to 5000 PSI (345
bar) pressure gauge at the
manifold G port
1.16.4 Plumb a 0 to 5000 PSI (345
bar) pressure gauge into the
manifold P port
1.16.5 Plumb a 0 to 5000 PSI (345
bar) pressure gauge into the
hose from the lift up cylinder
cap end.
1-36
Test
Basic check of likely causes
DC - Is pump motor running?
Gas - Is engine running at high
idle
Engage the enable and Tele-
scope Out switch. Check the
pressure.
Engage the enable and Tele-
scope Out switch. Check pres-
sure at manifold P port
Check pressure at the tele-
scope cylinder while activating
telescope out at ground con-
trols
Test
Basic check of likely causes
DC - Is pump motor running?
Gas - Is engine running at high
idle
Engage the enable and Tele-
scope in switch. Check the
pressure.
Engage the enable and Tele-
scope in switch. Check pres-
sure at manifold P port
Check pressure at the tele-
scope cylinder while activating
telescope in at ground controls
T350 T500J
Result
Yes
No
Yes
No
Above Min. Tele Out Pressure psi
(bar)
Below Min. Tele Out Pressure psi
(bar)
Above Min. Tele Out Pressure psi
(bar)
Below Min. Tele Out Pressure psi
(bar)
Above Min. Tele Out Pressure psi
(bar)
Below Min. Tele Out Pressure psi
(bar)
Result
Yes
No
Yes
No
Above Min. Tele In Pressure psi
(bar)
Below Min. Tele In Pressure psi
(bar)
Above Min. Tele In Pressure psi
(bar)
Below Min. Tele In Pressure psi
(bar)
Above Min. Tele In Pressure psi
(bar)
Below Min. Tele In Pressure psi
(bar)
Corrective Action
Possible Causes: 4.1.32, 4.1.33, 4.1.37
Go to step 1.15.3
See 1.2 Pump Motor Will Not Operate -
DC Powered Models
Go to step 1.15.3
See 1.8 Engine High Idle Inoperative -
Engine Models
Go to step 1.15.5
Go to step 1.15.4
Possible Causes: 4.1.38, 4.1.45,
4.1.74, 4.1.40, 4.1.10, 4.1.43
Possible Causes: 4.1.10, 4.1.46,
4.1.47, 4.1.74, 4.1.45, 4.1.39
Possible Causes: 4.1.49, 4.1.48, 4.1.41
Possible Causes: 4.1.42, 4.1.50
Corrective Action
Possible Causes: 4.1.32, 4.1.33,
4.1.37
Go to step 1.16.3
See 1.2 Pump Motor Will Not Operate -
DC Powered Models
Go to step 1.16.3
See 1.8 Engine High Idle Inoperative -
Engine Models
Go to step 1.16.5
Go to step 1.16.4
Possible Causes: 4.1.38, 4.1.45,
4.1.74, 4.1.40, 4.1.10, 4.1.43
Possible Causes: 4.1.10, 4.1.46,
4.1.47, 4.1.74, 4.1.45, 4.1.39
Possible Causes: 4.1.49, 4.1.48,
4.1.41
Possible Causes: 4.1.42, 4.1.51
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