Hydraulic Section
8-38
31211015 6036, 6042, 8042, 10042, 10054
8.6 HYDRAULIC RESERVOIR
Hydraulic reservoir (1) and fuel tank are one unit located on
the right side of the frame. The hydraulic fluid filler/breather
and filter are accessed under cover (2).
Occasionally, fluid may seep, leak or be more forcefully
expelled from the filler/breather (3) when system pressure
exceeds the rating of the breather. If the return filter
becomes plugged, return hydraulic oil will bypass the filter
when pressure reaches 25 psi (1,7 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 removed from the machine, 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.
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 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. Properly disconnect the battery. Refer Section 9.8,
“Battery”, for procedure.
5. Remove filter access cover (2).
6. Remove the filler/breather cap (3) on the hydraulic oil
reservoir (1). Remove the drain plug (4) on the bottom
of the hydraulic oil reservoir.
7. 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 (4).
8. 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. Refer to Section 8.6.3,
“Hydraulic Filter Replacement”.
3. Fill the hydraulic reservoir. Refer to Section 2.3, “Fluid
Specifications”.
4. Properly connect the battery. Refer Section 9.8,
“Battery”, for procedure.
5. Remove the Do Not Operate Tags from both the ignition
key switch and the steering wheel.
6. Close and secure the engine cover.
8.6.3 Hydraulic Filter Replacement
1. Be sure the reservoir is clean and free of all debris.
2. Loosen and remove the six nuts (5) securing the filter
cover (6) to the hydraulic reservoir.
3. Remove the filter (7) and spring (8) from the hydraulic
reservoir allowing any excess hydraulic oil to drain into
the reservoir.
4. Replace the hydraulic filter head gasket (9) if necessary.
5. Install the new hydraulic filter and spring. Lower the
hydraulic filter assembly into the hydraulic reservoir.
6. Install the six previously removed nuts securing the
hydraulic filter cover to the hydraulic reservoir. Torque
the nuts to 75 lb-in (8.5 Nm).
7. Install the previously removed access cover (2).
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