Edwards DRYSTAR GV Series, Instruction Manual

Page: 38 / 58

A705-74-880 Issue K
Page 32 © Edwards Limited 2009. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
MAINTENANCE
# You must have a Routine Maintenance Kit to do these maintenance operations. Oil change frequency is
recommended based on the pump running at 122°F (50°C) case temperature. If the pump is run at elevated
temperatures, it is recommended that SHC630 oil be used and a higher frequency of oil change may be required.
Consult Edwards for advice.
* If the gearbox or high vacuum bearing oil is contaminated (indicated by a change in colour of the oil, for example,
water contamination will turn the oil a white colour), you must change the oil. You may be able to remove the
contaminants from the oil by filtration.
** You must have a new pump-motor and a Motor Fitment Kit to do this maintenance operation.
*** You must have a PRV Overhaul kit to do this operation.
**** You must have an Inlet End (Upper) Bearing Kit, a Gearbox End Bearing Kit, a Swept Volume Kit and a Swing
PRV Overhaul Kit to overhaul the pump.
## You will need a Motor Fitment Kit to do this maintenance operation.
5.3 Checking and filling the gearbox oil (if necessary)
In order to check the gearbox oil level, the pump must be switched off and stationary.
If the gearbox requires oil frequently, or if there is a sudden loss of a large amount of oil, the pump may be faulty:
shut down the pump and contact your supplier or Edwards.
Table 6 - Maintenance Plan
Operation Frequency Refer to Section
Check the gearbox oil level and fill the gearbox with oil (if necessary)* Weekly 5.3
Check the high vacuum bearings oil level and fill with oil (if necessary) Weekly 5.4
Inspect the gas-ballast system Monthly 5.5
Inspect the pipelines and connections Quarterly 5.6
Inspect the interstage relief valve and replace the hinge bushes, flap and
O-ring (if necessary)*** 18 Months 5.7
Change the gearbox oil and clean the oil-level sight-glass # 18 Months 5.8
Change the high vacuum bearings oil and clean the oil-level sight-glass # 18 Months 5.9
Replace high vacuum vent filter # 18 Months 5.10
Clean the cooling-jacket # 18 Months 5.11
Replace the interstage relief valve (GV600 and GV410 only) When necessary 5.12
Replace the pump-motor ** When necessary 5.13
Replace the coupling insert ## Yearly 5.14
Overhaul the pump **** Every 6 years 5.15
WARNING
The pressure in the gearbox will be equal to the pressure of the shaft-seals purge gas supply.
Always equalise pressure before removing the oil filler-plug or oil drain plug to avoid oil being
ejected under pressure from the gearbox.
WARNING
Particular caution should be exercised when working with Fomblin oil that may have been exposed
to temperatures above 260°C. Refer to the Edwards Materials Data Sheets for detailed
information.