JLG G5-18A Service Manual - Manual (Page 100)

Hydraulic System
8-10 G5-18A, 2505H, 25.5
8.8 HYDRAULIC RESERVOIR
The hydraulic reservoir and fuel tank are part of the
frame. For this reason, neither tank can be removed. For
cleaning instructions, see Section 7.4.2, “Fuel/Hydraulic
Oil Tank.”
Occasionally, fluid may seep, leak or be more forcefully
expelled from the filter head when system pressure
exceeds the rating of the filter head or filler cap. If the
return filter becomes plugged, return hydraulic oil will
bypass the filter when pressure reaches 22 psi (1,5 bar)
and return to the reservoir unfiltered.
Carefully examine fluid seepage or leaks from the
hydraulic reservoir to determine the exact cause. Clean
the reservoir and note where any seepage occurs.
Leaks from a cracked or damaged reservoir require that
the reservoir be flushed completely with water and
repaired by a certified welder using approved techniques.
If these conditions cannot be met, the reservoir must be
replaced in its entirety. Contact the local JLG dealer
should reservoir welding be required.
8.8.1 Pressurized Hydraulic Oil Fill Cap
The fill cap will allow the hydraulic oil reservoir to
pressurize to 2 psi (0,14 bar). Inspect the condition of the
cap seal to maintain proper reservoir pressure.
8.8.2 Hydraulic Oil Reservoir Draining
1. Park the machine on a firm, level surface, fully
retract the boom, support the boom, place the
transmission control lever in (N) NEUTRAL, engage
the park brake and shut the engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel, stating that the
machine should not be operated.
3. Open the battery and engine covers. Allow the
system fluids to cool.
4. Properly disconnect the battery.
5. Remove the drain plug at the bottom of the hydraulic
oil reservoir.
6. Transfer the used hydraulic oil into a suitable,
covered container, and label as "Used Oil". Dispose
of used oil at an approved recycling facility. Clean
and reinstall the drain plug.
7. Wipe up any spilled hydraulic oil.
8.8.3 Hydraulic Oil Reservoir Filling
1. Be sure the reservoir is clean and free of all debris.
2. Install new hydraulic oil filters.
3. Fill the reservoir with Cat HDO oil. Refer to Section
2.4, “Fluids, Lubricants and Capacities.”
4. Properly connect the battery.
5. Close and secure the battery and engine covers.
6. Remove the Do Not Operate Tags from both the
ignition key and the steering wheel.
7. Start the machine. Run engine to normal operating
temperature. Operate all hydraulic functions.