JLG 4017 Service Manual - Manual (Page 107)

8.7 4017
Hydraulic System
8.5 HYDRAULIC RESERVOIR
The hydraulic oil reservoir is a one piece unit. It is located
under the rear of the machine cab. Occasionally, fluid
may seep, leak or be more forcefully expelled from the
breather when system pressure exceeds the rating of the
filter head or breather. If the return filter becomes
plugged, the return hydraulic oil will bypass the filter when
pressure reaches 1,7 kPa (25 psi) 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.
8.5.1 Hydraulic Oil Reservoir Draining
1. Park the machine on a firm, level surface, fully
retract and lower the boom, place the transmission
control lever in (N) NEUTRAL, engage the park
brake and shut the engine OFF.
2. Place an Accident Prevention 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 hydraulic fluid to
cool.
4. Remove the drain plug at the bottom of the hydraulic
oil reservoir.
5. 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.
6. Wipe up any hydraulic fluid spillage in, on, near and
around the machine and the 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 Mobilfluid 424 ® Tractor
Hydraulic Fluid (ISO 46). Refer to Section 2.4,
“Fluids, Lubricants and Capacities.”
4. Start the machine. Run the engine to normal
operating temperature. Operate all hydraulic
functions to remove any trapped air in the system.
8.5.3 Hydraulic Oil Reservoir Removal
If it is determined that the hydraulic oil reservoir must be
removed, the hydraulic oil must be drained before
reservoir is removed. Always dispose of oil properly.
a. Reservoir Removal
1. Park the machine on a firm level surface, fully retract
the boom, lower the boom, place the transmission
control lever in NEUTRAL (N), engage the park
brake and shut the engine off.
2. Place an Accident Prevention 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 fluid to
cool.
4. Remove the negative (-) battery cable from the
battery negative terminal.
5. Refer to Section 8.5.1, “Hydraulic Oil Reservoir
Draining,” for draining procedure.
6. Remove and cap the four return hoses on the
hydraulic oil reservoir.
7. Loosen the clamps and remove and plug the suction
and return hoses on the hydraulic oil reservoir.
8. Plug and cap the fittings on the hydraulic oil
reservoir.
9. Support the hydraulic oil reservoir from the bottom
and remove the six bolts and nuts.
10. Carefully lower the reservoir to the ground.
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.
MZ0130