Manual 1808 Rev B p/n 001808 0000
15
07
Maintenance
Oil Plugs / Ventilator
1. Prior to removing plugs, ensure that the pump
has cooled sufciently so that oil will not burn.
2. Remove ventilator plug prior to removing level
and/or drain plug.
WARNING
Do not stand over ventilator plug while
removing as pressure build up behind valved
ventilator may cause it to eject when removed.
3. Place a container under the oil drain plug to be
removed.
NOT: N It is recommended that the oil should
be slightly warm (104°F – 122°F [40°C –
50°C]) when drained. Cooler oil will be
more difcult to drain correctly.
4. Rell oil through the ventilator position.
5. Ret all plugs after lling.
6. Clean away oil spillage.
BEARING LUBRICATION
Where re-greasing points are provided, add 2
shots monthly of NLGI 2 grade grease.
CLEANING
1. With the drive stationary, periodically clean any
dirt or dust from the gear unit and the electric
motor cooling ns and fan guard to aid cooling.
2. Ensure dust buildup does not exceed 0.2 in.
(5 mm).
OIL SEPARATOR
All KD-30 and KD-50 blowers built since October
1984 are tted with oil mist eliminators in the oil
separator. If the oil separator has a lter, it will be
necessary to periodically replace the lter element
and remove any sludge accumulation.
The frequency of this is dependent upon the
following conditions:
• Visual inspection shows the element to be
blocked by foreign matter. A back pressure
through the lter element exceeding 6 PSlG
indicates that the lter element is unduly
restricting the gas ow and should be changed.
• Motor current exceeds manufacturer’s
specications.
• A ruptured element or the gaskets are not
sealed, allowing mist to be discharged.
The oil separator on KD-30A and KD-50B pumps
is equipped with an oil drain-back device to return
oil to the reservoir that has penetrated the lter
element. The check-type drain-back closes to
prevent the exhaust gas from bypassing the lter
when the inlet pressure is high and opens to
allow the oil to drain back as the inlet pressure
is reduced. If the pump is operated at high inlet
pressures, over 5 Torr, for time periods exceeding
several hours, no drain-back can occur and lter
efciency is reduced. Under such conditions,
isolate the pump from the system with the main
isolation valve, and run at blank-off pressure for
15 – 30 minutes to allow the oil to drain back. If
the pump is always operated with lengthy high
pressure, then install an external oil return line as
follows.
A return line can be installed to return oil that
collects in the lter area back to the pump.
The successful operation of this arrangement
is dependent upon having the oil return to the
pump at a point that is compatible with the pump
operating pressure level. See Figure 7-1 on page
16. Generally, oil must be returned to a low
pressure point. The oil separator has an oil return
valve that allows oil ow back when operating at
pressures below 5 Torr.
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