General Pump 72 Series Gearbox - Manual (Page 4)

GENERAL PUMP
A member of the Interpump Group
Gearbox-71 & 72 Series
4.2 Identification of the gear unit
The unit can be identified by the symbol on the outside
of the housing. The plates indicating the gear ratio and
the direction of rotation are affixed (see Fig. 2).
The plate giving the direction of rotation is present if the
gear unit is supplied with the pump. Conversely, it must
be affixed by the user and include the direction of
rotation given in section 6.3.
Page 4
4.2.1 Gear ratio
The gearbox is available in three different ratios:
1.25:1
1.50:1
1.83:1
4.2. On the job test
The maximum rated RPM of the pump must never be exceeded
Example: Pump KF40A
Maximum Internal Pump Speed: 900 RPM
Input Shaft Speed: 1500 (set by the user)
Input Speed/Internal Speed = Gear Ratio or Input Speed/Gear Ratio = Internal Speed
In this case the only ratio possible which does not exceed the maximum pump rated RPM is 1.83:1, in as
much as: 1500/1.25 = 1200 RPM Internal speed, 1500/1.5 = 1000 RPM Internal Speed and 1500/1.83 =
820 RPM Internal Speed. Therefore 1.83:1 is the only gear ratio permissable.
Ref 300761 Rev.B
12-11