JLG G12-55A AccuPlace Service Manual - Manual (Page 102)

Hydraulic System
8.12 G10-55A & G12-55A AccuPlace
8.6 HYDRAULIC RESERVOIR
The hydraulic reservoir (1) is located on the frame
between the engine compartment and the cab.
8.6.1 Hydraulic Oil Reservoir Draining
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower 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 engine cover. Allow the system fluids to
cool.
4. Disconnect the battery negative (-) cable from the
battery negative (-) terminal.
5. Open the filler cap (2) on the hydraulic oil reservoir.
Remove the drain plug (3) on the side 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 hydraulic fluid spillage in, on, near and
around the machine and the work area.
8.6.2 Hydraulic Oil Reservoir Filling
1. Be sure the reservoir is clean and free of all debris.
2. Install a new hydraulic oil filter.
3. Fill the reservoir with Mobilfluid 424 ® (ISO Grade 46)
oil. Refer to Section 2.4, “Fluid and Lubricant
Capacities.”
4. Connect the battery negative (-) cable to the battery
negative (-) terminal.
5. Close and secure the engine cover.
8.6.3 Hydraulic Oil Reservoir Removal/
Installation
If it is determined that the hydraulic oil reservoir must be
removed, the hydraulic oil must be drained before the
reservoir is removed. Always dispose of hydraulic oil
properly.
a. Reservoir Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower 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 engine cover. Allow the system fluids to
cool.
4. Disconnect the battery negative (-) cable from the
battery negative (-) terminal.
5. Drain the hydraulic oil reservoir. Refer to Section
8.6.1, “Hydraulic Oil Reservoir Draining.”
6. Label, disconnect and cap all hydraulic hoses
attached to the hydraulic oil reservoir. Cap all fittings
and openings to keep dirt & debris from entering the
hydraulic system.
7. Remove the bolts securing the hydraulic oil reservoir
to the frame.
8. Remove the hydraulic oil reservoir.
b. Disassembly
The hydraulic oil reservoir is a one-piece unit and cannot
be disassembled. The hydraulic oil level sight- glass and
hydraulic oil filler cap can be removed and reused on the
new replacement reservoir. Dispose of the old reservoir
according to local regulations concerning hazardous
materials disposal.
c. Cleaning and Drying
If contaminated hydraulic oil or foreign material is in the
tank, the tank can usually be cleaned.
Note: If a leak is suspected in the hydraulic oil reservoir,
contact JLG Service Department.
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