USE AND MAINTENANCE MANUAL
2-Speed Gearboxes Series CE
M
.CE.GEN.ENG.DOCX
Issued
2018
Rev.03
Page 34 / 59
4.3
O
IL
R
ECIRCULATING
L
UBRICATION
(F
ORCED
L
UBRICATION
)
In order to have a proper recirculating lubrication, there are different holes on the gearbox housing, to
be used according to the different assembling positions and working conditions (chapters 4.3 to 4.16).
Oil stagnation into the gearbox must be avoided, because it may cause overheating and reduce gearbox
efficiency. Make sure that the air pipe or the breather are not stuck and allow ventilation.
In case of oil return by fall-down, follow the instructions on pipe type and dimension.
Make sure that the oil input flow rate as well as the oil output flow rate (if a suction pump is used) are
steady and in accordance with the required values.
Pay attention to the use of the service holes according to the different applications.
In order to have an effective recirculating lubrication, the following indications should be followed:
•
The oil tank must be placed in a ventilated and cold area
•
The tank capacity should be at least 10 times the recirculating oil quantity
•
Oil return pipe must be straight, bends should be avoided (whenever possible)
•
Oil return pipe for fall down should have inner diameter Ø min = 20 mm
•
Oil back pressure in the return pipe from the gearbox must be avoided
•
A 60 μm filter and a pressure limitation valve
on the oil supply unit should also be used as a
safeguard
•
Overall rate for CE 11-12-13-13+-14-15 is 1,5 L/min
•
Overall rate for CE 16-18-20 is 3 L/min
Whenever a further reduction in working temperature is required, or if it is necessary to keep the
gearbox temperature within a strict range, recirculating lubrication may be used in the following ways:
•
Recirculating lubrication with intermediate tank
•
Recirculating lubrication with air-heat exchanger
•
Recirculating lubrication with cooling heat exchanger (chiller)
According to the way of lubrication of the gearbox, oil must be according to the following chart:
•
splash lubrication:
HLP 68 as per ISO VG 68
•
recirculating lubrication with intermediate tank:
HLP 46 as per ISO VG 46
•
recirculating lubrication with air-oil heat exchanger:
HLP 32 as per ISO VG 32
•
recirculating lubrication with cooling heat exchanger (chiller):
HLP 32 as per ISO VG 32
Using oil recirculating lubrication, in any assembling position, improves heat dissipation
in the gearbox. In case of continuous use at high rotation speed and with short
downtimes, oil recirculating lubrication is necessary.
If the instructions on lubrication are not followed, the gearbox may be irreparably damaged.
If the gearbox is damaged by wrong or lack of lubrication, no warranty will be applied.
