JLG T350 Service Manual - Manual (Page 154)

SECTION 5 - HYDRAULICS
5-12 – JLG Lift – 3121198
Outrigger Up
1. Install a pressure gauge at the port marked "G"
located on top of the block.
2. Plug and cap the hose on port "RA", or activate out-
rigger in until the cylinders are all bottomed out.
3. The gauge should read 2500 psi. (172.5 bar).
4. The outrigger relief valve is located on the front face
below the lift push button manual descent valve. To
increase, screw clock wise, to decrease screw coun-
ter clock wise.
5.4 HYDRAULIC OIL FILL AT STARTUP
1. Fill the tank.
NOTE: Step 2 applies to Gas Engine equipped models only.
2. Loosen the outlet port hose of the pump until oil is
seen. This ensures that air has been bled from the
suction line. Without doing this step, there could
be an air lock up on start-up, which can damage
the pump.
3. Manually lay the outriggers out so the pads are on
the ground.
4. Retract the outriggers.
5. Extend the outriggers.
6. Refill the hydraulic tank.
7. Raise the boom up to horizontal.
8. Raise the Jib (if applicable) to full stroke. Lower the
Jib with manual descent. (Needle valve at the Jib
cylinder). Close the needle valve when the Jib is fully
retracted.
9. Extend and retract platform level to full stroke in both
directions. Level the platform.
10. Lift up the boom to full stroke (or as high as the
boom will go).
11. Extend and retract platform level, then back to level.
12. Lift down the boom using manual descent. Bring the
boom down to the boom rest.
13. Repeat the lift up and down function using the
switch, not manual descent.
14. Telescope the boom out to full stroke.
15. Telescope the boom in to the end of stroke.
16. Swing the turn-table1/8th turn in both directions.
17. Retract the outriggers.
18. Refill the tank to the full mark on the dipstick.
5.5 HYDRAULIC HOSES
When replacing any of the hoses that run through the cen-
ter of the turntable, make sure the boom is positioned
180° opposite from the tongue and not over the tongue.
Failure to have the boom properly positioned will cause
the hoses to experience excessive twisting during swing
operations and will cause premature failure of the hose.
5.6 HYDRAULIC FILTER AND BREATHER
When changing the hydraulic filter, inspect the o-ring on
the cap for any nicks or tears. Replace the o-ring if there is
any damage. Check the breather line (clear line) that runs
from the hydraulic tank to the breather to ensure it is free
from oil and not pinched or damaged. If oil has ever
entered the breather, it must be changed. This can hap-
pen if the hydraulic tank is overfilled or the breather line
gets pinched.
NOTE: The cap securing the filter must be torqued 154 to
170 ft.lbs. (209 to 230.5 Nm).