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Purging the Hydraulic system
NOTE: Before operating the Lippert Components, Inc. hydraulic system, make sure the system has been
purged of air introduced into the hydraulic lines during installation.
Fluid Recommendation
Automatic transmission fluid (ATF) with Dexron®III or Mercon®V or a blend of both is recommended by Lippert
Components, Inc. For a list of approved fluid specifications, see
com/technical-information-sheets/leveling-and-stabilization/ccd_0002088.pdf).
NOTE: In colder temperatures (less than 10° F) the jacks may extend and retract slowly due to the fluid's
molecular nature. For cold weather operation, fluid specially formulated for low temperatures may
be desirable.
Purging the System
NOTE: Make sure jacks are fully retracted prior to filling reservoir to prevent over-filling
1.
Zip-tie any loose wiring or hydraulic lines.
NOTE: The basic purge procedure to bleed the Lippert Hydraulic Systems can be performed without the
use of any tools. The hydraulic system will purge the air from the hydraulic lines and cylinders by
simply running the pump.
NOTE: It is recommended to perform a minimum of three complete cycles (steps 2-7) to ensure both
proper function and adequate fluid level of the system.
2.
Start with all hydraulic components in the fully retracted position, meaning all jacks and slide-outs are
brought back inside the coach as if the coach were ready for travel.
3.
Find the hydraulic pump location and note the amount of fluid currently in the reservoir. The fluid level
should be about 1/4" from the top of the reservoir and no more than 1/2" from the top.
NOTE: When checking the fluid level after ensuring all hydraulic components are retracted, note if there
are any bubbles, froth or foam on top of the fluid. This is an indication that air has been pushed back
to the reservoir when the hydraulic components were retracted in the last cycle. Wait 15-20 minutes
for the foam to dissipate before beginning the purge process.
4.
If there is no froth or foam in the reservoir and the fluid is not within 1/2" of the top, fill the reservoir to
within the level described in step 3.
5.
With the fluid level full and no foam in the reservoir, begin cycling the hydraulic system.
6.
Extend jacks fully, taking the coach off the tires. If the coach has hydraulic slide-outs, extend all
slide-outs. Once all jacks and slide-outs are extended, immediately retract all slide-outs and then jacks.
7.
Check the reservoir for foam. If foam is present, see NOTE following step 3 and then repeat steps 4-6.
8.
Repeat these steps until no foam is present in the reservoir. If no foam is present, the system is purged of air.
Rev: 08.20.21
TI-188
(https://lci-support-doc.s3.amazonaws.
Page 14
CCD-0003696
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