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Compact Track Loader
11. Maintenance
Hydraulic Fluid/Filter Change
Hydrostatic components require extremely clean oil in
order to have a long service life. Use extreme caution
when changing the hydraulic oil. Introducing dirt or
debris could be detrimental to the hydraulic system.
Terex recommends service intervals of 500 hours for
hydraulic fluid and 250 hours for hydraulic fluid filters.
To change the hydraulic fluid:
1. Remove the two fasteners (B) from the belly pan
near the front of the PT-100 Forestry. Then pivot it
down to gain access to the drain plug (fig. 11-25)
2. Remove the drain plug (C) using the correct size
allen type wrench or allen socket to avoid damag-
ing the drain plug. (fig. 11-26)
3. Drain the hydraulic fluid into a suitable catch con-
tainer.
4. Locate the two hydraulic filters in the right rear cor-
ner of the engine compartment. (fig. 11-27)
5. Thoroughly clean around the filters to prevent dirt
or debris from entering the system and remove the
filters by hand or with a strap as required.
6. Check to make sure the filter gaskets are still pres-
ent on the old filters. If not, check the filter heads
to make sure they are free from old gasket materi-
al prior to installing the new filters.
7. Prepare the new filters by rubbing a small amount
of fresh hydraulic oil onto the filter gasket surface
and then threading them onto their respective filter
heads. Tighten filters by hand as instructed by
label located on the filter or filter box.
8. Install the hydraulic system drain plug and tighten.
9. Pivot and secure the belly pan as found in step 1.
10. Remove the hydraulic reservoir filler cap and fill
the hydraulic system with Terex Premium All
Season MV Hydraulic Oil or equivalent until the full
mark on the hydraulic fluid sight gauge has been
reached. (fig. 11-28, 11-29)
11. Install the hydraulic reservoir filler cap and tighten.
12. Start the PT-100 Forestry and operate all hydraulic
circuits to work any trapped air out of the system.
• Drive forward and backward.
• Raise and lower the lift arms (unloaded).
• Dump and curl bucket/quick attach.
11-27
11-28
11-29
13. Once you have purged the air from the system,
check the level on the hydraulic fluid level sight
gauge. If the level is low repeat step 10 and 11 to
complete the procedure.
11-14
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