Tower Telescope Pvg Valve Obstructed; Tower Telescope Pvg Valve Parameters Incorrect - JLG 1250AJP Troubleshooting Manual

1.344 TOWER TELESCOPE PVG VALVE OBSTRUCTED

Flash Code: 4-5
Tower telescope PVG valve obstructed. Tower telescope PVG valve spool is not free to move completely. This could be from
contamination inside the valve or a blocked filter.
Note Pretest Instructions
1.344.1
1.344.2
1.344.3
1.344.4 Mark to identify the tower
tele PVG valve actuator
[X067] using string, tape,
etc. Swap it with an actuator
that doesn't have a fault.
1.344.5
1.344.6 Inspect all 4 hydraulic filters
and housings and replace all
4 filters: output of function
pump, platform filter (If filter
is not external to platform
valve it must be updated.),
return filter and charge filter
(for drive pump). Take note
of filters/housings that have
contamination.
1.344.7

1.345 TOWER TELESCOPE PVG VALVE PARAMETERS INCORRECT

Flash Code: 4-5
Tower telescope PVG valve parameters incorrect. Programing parameters contained in the tower telescope PVG valve do
not match those stored in the ground module. The valve needs to be calibrated.
Note Pretest Instructions
1.345.1 Calibrate boom valves. See
5.4 Calibrating Boom
Valves on Pg. 296 for
details.
3128411
SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING
Test
Is there dirt in the hydraulic module part of the
valve, especially around the spool?
Is the filter at the tower tele PVG valve [X067]
pilot oil inlet blocked?
Is the fault clear?
Perform 5.4 Calibrating Boom Valves on Pg.
296. Does fault move to new location of actua-
tor?
Does the return filter have contamination in fil-
ter media or housing?
Cycle boom from fully lowered and retracted
to fully extended and then back. Test hydraulic
fluid. Does it test bad, appear cloudy, appear
dark, smell burned or is otherwise abnormal?
-OR- Was there any contamination in the filters
or housings?
Do machine hydraulics function properly?
Test
Did it pass calibration?
1250AJP
Result Corrective Action
Yes Clean and repair as needed.
Go to step 1.344.2
No Go to step 1.344.2
Yes Clean and repair as needed.
Go to step 1.344.3.
No Go to step 1.344.3
Yes Go to step 1.344.5
No Go to step 1.344.4
Yes Replace PVG valve actuator that was initially on
the tower tele PVG valve [X067].
Go to step 1.344.5
No Replace hydraulic module of tower tele PVG valve
[X067].
Go to step 1.344.5
Yes Go to step 1.344.6
No Troubleshooting complete
Yes Replace all hydraulic fluid
Go to step 1.344.7
No Go to step 1.344.7
Yes Troubleshooting complete
No Replace hydraulic components that are not func-
tioning properly. Focus first on components
upstream of any filters/housings with contamina-
tion. Calibrate if necessary.
Result Corrective Action
Yes Troubleshooting complete. If fault is recurring
replace tower tele PVG valve [X067] actuator.
No Replace tower tele PVG valve [X067] actuator
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