JLG G12-55A Service Manual - Manual (Page 130)

Hydraulic System
8-10 G10-55A, G12-55A
8.5 HYDRAULIC RESERVOIR
The hydraulic reservoir (1) is located on frame between
engine compartment and cab.
8.5.1 Hydraulic Oil Reservoir Draining
1. Park machine on a firm, level surface, level machine,
fully retract the boom, lower boom, place
transmission control lever in (N) NEUTRAL, engage
park brake and shut engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel.
3. Open engine cover. Allow system fluids to cool.
4. Properly disconnect the batteries.
Note: If equipped with extreme cold weather
components, the hydraulic oil heating element must be
removed to drain the hydraulic tank.
5. Remove drain plug (2) on hydraulic oil reservoir and
drain hydraulic oil into a suitable container.
Note: Proper precautions must be used to ensure any
hydraulic oil being drained is contained and disposed.
6. Transfer used hydraulic oil into a suitable covered
container, and label as “Used Oil”. Dispose of used
oil at an approved recycling facility. Close drain valve
and remove drain hose.
7. Wipe up any hydraulic fluid spillage in, on, near and
around machine and work area.
8.5.2 Hydraulic Oil Reservoir Filling
1. Be sure reservoir is clean and free of all debris.
2. Install a new hydraulic oil filter.
3. Fill the reservoir with hydraulic oil. Refer to Section
2.5, “Fluid and Lubricant Capacities.”
4. Properly connect the batteries.
5. Close and secure the engine cover.
6. Remove Do Not Operate Tags from both ignition key
switch and steering wheel.
8.5.3 Hydraulic Oil Reservoir Removal/
Installation
Note: If determined that hydraulic oil reservoir must be
removed, hydraulic oil must be drained before reservoir
is removed. Always dispose of hydraulic oil properly.
a. Reservoir Removal
1. Park machine on a firm, level surface, level machine,
fully retract the boom.
2. Raise and properly support boom to adequate
height to allow for removal of reservoir tank.
3. Place transmission control lever in (N) NEUTRAL,
engage park brake and shut engine OFF.
4. Place a Do Not Operate Tag on both ignition key
switch and steering wheel.
5. Open engine cover. Allow system fluids to cool.
6. Properly disconnect the batteries.
7. Drain the hydraulic oil reservoir. Refer to Section
8.5.1, “Hydraulic Oil Reservoir Draining.”
8. Label, disconnect and cap all hydraulic hoses
attached to hydraulic oil reservoir.
9. Cap all fittings and openings to keep dirt and debris
from entering the hydraulic system.
10. Remove the bolts securing the hydraulic oil reservoir
to the frame.
11. 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.
MY767
1
2