REV
. 10
22-04-2020
INSTALLATION
,
USE AND MAINTENANCE MANUAL
–
PN
20 / 40
Jurop
SpA
Via Crosera n° 50
33082 Azzano Decimo, PN (Italia)
T
EL
. +39 0434 636811 F
AX
. +39 0434 636812
http://www.jurop.it
e-mail: [email protected]
-
+
½ giro
40 – 80 g/h
Assemble operation
• Lubricate and then insert all the vanes into their seats (1).
• Reassemble the components in the following order:
Decompressor flange (2): avoid damaging the seal rings (8)
while fitting them on the shaft. Centre properly and tighten the
screws. Insert the bearings (10) and (12) properly and all the
way into their seats. It is recommended to replace the O-Ring
(1).
Gear wheel (4) with relative bearing (11) and seal ring (7).
Pinion (5) and self-locking flanged nut (14)
Gear box and its gasket.
Cardan shaft guard.
Attention: do not damage the components during
assembly by forcing them excessively.
General warnings
• When changing the vanes do not forget to carefully clean all the
components that you have dismantled. Clean the oil filter and the oil
tank from the solid sediments. The models PN 106, are provided with a
side oil tank; be careful to the maximum tight torque of the oil filter plug.
Maximum torque: 10Nm.
• The front bearing has been greased during pump’s assembling.
Lubrication of said bearing is necessary after long working periods only
(for example, normal duration of a set of vanes). It is consequentely
suggested to pump carefully new grease through the lubrication nipple
in order to avoid damages to the seals.
• Procedure for tightening the self-locking flanged nut on the rotor:
FFasten the decompressor to a bench or to the machine
frame.
Fit the feather key and flange on the rotor. Use a pad and a
hammer to put the half-joint fully into place correctly.
Fully tighten the nut by hand.
Lock the rotor rotation.
Start tightening the nut with a suitably calibrated torque
wrench: 100 Nm for M20X15 nut (PN23-33); 250Nm for M24X2
nut (PN45-…-106).
For final tightening, use a torque wrench set at 160 Nm for
M20X15 nut (PN23-33) and 350Nm for M24X2 nut (PN45- ... -
106).
Carry out a continuous movement of about 30° without
interruptions until the nut stops when the wrench clicks at the
set torque.
Mounting the hydraulic drive
• We recommend the drive coupling be oiled when vanes are being
replaced.
• However lubricate the drive coupling every 1500 hours.
We recommend the drive coupling be oiled every
1500 hours.
• Apply coupling hub to vacuum pump axis respecting the position
marked during disassembly: the grain must go back into the seat on the
rim.
• Mount the coupling and lubricate internally with NLGI 2 Lithium
grease. Provide an adequate quantity of fat, in order to have a medium
filling.
• Reassembly the motor without forcing onto the seals.
Adjusting the self-lubricating pump
• Only for decompressors equipped with automatic lubrication
pump.
• The automatic lubricating pump is adjusted by the manufacturer
before the shipping.
• If consumption noticeably differs from the indicated value, adjust it
as follows:
-
Remove the upper protection cover;
-
Using a screwdriver and a 10 mm wrench, adjust the adjusting
screw (K). Close the nut and remount the upper protection cover;
-
It is advisable to turn the screw of ¼ of turn and verify the actual
consumption.
Pic. 6.9
Do not reduce oil consumption below the value
indicated in par. 2.2 (for functioning at speeds
different from the maximum, flow is proportionate
to rotating speed).
• ½ turn of the adjusting screw causes a variation in the flow of
approximately
40 - 80 g/h
, depending on using conditions.
Cleaning of the inside exhaust port of the pump housing
• Frequency: at every changing of the vanes.
• How to proceed: dismantle the manifold and remove possible
oilscales or other foreign parts.
• The clogging-up of this manifold and the exhaust port depends
mainly from heavy duty use of the pump and causes an increase of
temperature and a non-perfect closing of the check valve. A careful
cleaning of all components, including the insides of the housing and the
non-return check valve and its seat, is therefore strongly
recommended.