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A.0500.501 – IM-TGGS/05.01 EN (03/2013)
3.13 Extra clearances
To handle extra clearances following clearance classes are defined:
C0 = Pump cover axial clearance set at minimum
C1 = Standard clearance (not indicated because standard)
C2 = ~2 x standard clearance
C3 = 3 x standard clearance
To indicate required clearances a code of 4 digits, xxxx, is given on the order.
The figure ‘‘1’’ stands always for ‘‘normal’’ and no special action is considered.
The indicated numbers in the tables below are average values in microns (µm).
Radial clearance on rotor, idler outside diameter – Axial clearance on pump cover
Pump size
C0 (µm)
axial clearance
pc set minimum
C1 (µm)
normal
C2 (µm)
= 2.2 x C1
C3 (µm)
= 3 x C1
Code rotor
1xxx
1xxx
2xxx
3xxx
Code idler
x1xx
x1xx
x2xx
x3xx
Code pump cover
assembly
xxx0
xxx1
xxx2
xxx3
TG GS2-25
35
107
235
320
TG GS3-32
35
107
235
320
TG GS6-40
40
125
275
375
TG GS15-50
52
160
350
480
TG GS23-65
56
170
375
510
TG GS58-80
66
200
440
600
TG GS86-100
72
220
480
660
TG GS185-125
85
255
560
765
Diametral clearance on pin / idler bearing
Pump size
C1 (µm)
normal
C2 (µm)
= 2 x C1
C3 (µm)
= 3 x C1
Code for adapted 6 material pin (2 or 3) *)
xx1x
xx2x
xx3x
Code for adapted bronze idler bush (Y or Z ) **)
xx1x
xxYx
xxZx
TG GS2-25
90
180
270
TG GS3-32
90
180
270
TG GS6-40
110
220
330
TG GS15-50
150
300
450
TG GS23-65
160
320
480
TG GS58-80
240
480
720
TG GS86-100
275
550
825
TG GS185-125
325
650
975
The extra clearances are realised as follows:
Rotor and Idler:
By extra machining of outside diameter (code 2, 3);
or standard = 1
Pump cover:
By adjusting during assembly (code 0, 2 , 3);
or standard = 1
Idler pin / bush bearing; 2 cases are possible: (standard = 1)
*) case 1: by providing a special pin (6 material) with
adapted pin diameter (code 2 or 3)
**) case 2: by providing a special bronze bush with adapted
inside bush diameter (code Y or Z).
