9.5 Change the Hydraulic Fluid and
Filter
CAUTION!
Risk of burns to exposed skin.
Hydraulic uid gets hot during
operation, which makes hoses,
lines, and other parts hot as well.
Wait for the uid and components to
cool before starting maintenance or
service.
Change the hydraulic fluid and filter every 100 hours of
operation or annually.
Wait for the machine to cool down before changing the hydraulic
fluid. However, it is best to change the fluid while the machine is
warm to keep any contaminants in suspension.
The filter is located on the back, LH side of the hydraulic-fluid
reservoir.
1. Set the machine to a safe condition.
For instructions, see Safe Condition on page 9.
2. Place a drain pan under the fluid filter.
Make sure the drain pan is large enough to collect and
contain the hydraulic fluid that will drain from the filter and
reservoir.
3. Remove the bottom hose and strainer to drain the fluid.
4. Wait for the hydraulic fluid to fully drain from the reservoir.
5. Remove the fluid filter. A filter wrench may be required.
6. Apply a light coat of clean lubricant to the seal, and then
install the new filter. Only tighten it by hand, and then
tighten it another half turn.
7. Install and secure the strainer and bottom hose.
8. Fill the reservoir with Dexron III ATF or an acceptable
substitute. The reservoir capacity is 6.8 US gal (26 L).
For more information, see Add Hydraulic Fluid to the
Reservoir on page 31.
9. Start the machine.
For instructions, see Start the Machine on page 32.
10. Advance and retract the push block for 1–2 minutes to
remove air from the hydraulic system.
11. Check the fluid filter for leaks.
12. Stop the machine.
For instructions, see Stop the Machine on page 32.
13. Check the hydraulic fluid level. Add fluid, as required.
For instructions, see Check the Hydraulic Fluid Level on
page 31.
14. Dispose of the used hydraulic fluid in an environmentally
safe manner.
01156
Fig. 55 – Hydraulic fluid filter
Service and Maintenance
WP845 / WP875
Trailer Firewood Processor
60
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