Cause/Solution |
|
The main cause for hydraulic fluid to leak from the arbor is a faulty or damaged seal.
If leaks from the hydraulic sleeves or from anywhere else on the arbor besides the plunger are minor (drops of fluid
that form on the surface of the arbor over the period of a few days or weeks), this is normal. Instruct the operator to wipe
the fluid with a cloth or paper towel as it appears.
- Cause: The plunger seal is leaking. This is the most probable point for leakage as it is the only moving seal in the arbor.
Solution: It is possible that some fluid may be left in
the plunger bore after manufacturing or after some service procedures where the
plunger was removed or replaced. This fluid will migrate to the opening of the
bore during use and will leak out. The amount that leaks will decrease until it
eventually dries out (a few weeks to a few months). To determine if the fluid
coming from the plunger bore is leaking past the seals or if it is simply the
result of manufacturing or service procedures, follow the guidelines below:
- If the arbor hydraulic system is losing fluid,
the system needs to be refilled frequently (more than once every two months),
and there is a considerable amount of fluid coming out of the plunger bore, the
plunger seals are most likely leaking. Replace the plunger components as
necessary according to the procedure, Replacing the arbor plunger assembly.
- If there is fluid in the plunger bore beside the
plunger that can be seen when the pushrod assembly is removed, but the system
does not need to be refilled frequently, clean out the bore using a disposable
plastic pipette and cotton swabs with an extension, refer to the procedure, Replacing
the arbor plunger assembly. Top up the hydraulic system according to the
procedure, Topping up the arbor hydraulic fluid level and monitor the
fluid level in the weeks that follow. If fluid again starts to accumulate in
the bore, replace the plunger components as described in the procedure, Replacing
the arbor plunger assembly.
- If there is fluid coming out of the plunger
bore, but there is no accumulation in the bore next to the plunger, clean the
threads in the bore as well as possible and monitor the plunger as described in
the previous example. It may be possible that there was a small amount of fluid
that remained in the bore after final assembly in the manufacturing process
or after a service procedure was done.
- Cause: The hydraulic expanding sleeve seals are leaking.
Solution: If there is excessive fluid leaking from the
hydraulic expanding sleeves, the arbor needs to be sent for sleeve replacement.
- Cause: The plugs in the ends of the arbor are leaking.
Solution: If there is excessive fluid leaking from either
the end of the tailstock section of the arbor or inside of the headstock end of
the arbor from the hydraulic plugs, replace the seals on the hydraulic plugs.
See Replacing the hydraulic plug O-rings.
- Cause: The hydraulic line fittings are leaking.
Solution: If there is excessive fluid leaking from the
inside of the arbor at the location where the hydraulic line enters the
headstock shaft or tailstock shaft, the hydraulic fittings are most likely
leaking and require replacement—shine a light into the 16 mm holes and look at
the faces of the headstock and tailstock shafts to determine this. The
hydraulic line will need to be replaced at the same time the fittings are
replaced. See Replacing the arbor hydraulic line.
- Cause: The fill port plug is leaking.
Solution: Replace the fill port O-ring (part number 316-00083).
If there is fluid leaking from anywhere else, contact Creo support.
|
