Extra Clearances - Johnson Pump TG GS2-25 Instruction Manual

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
Code rotor
Code idler
Code pump cover
assembly
TG GS2-25
TG GS3-32
TG GS6-40
TG GS15-50
TG GS23-65
TG GS58-80
TG GS86-100
TG GS185-125
Diametral clearance on pin / idler bearing
Pump size
Code for adapted 6 material pin (2 or 3) *)
Code for adapted bronze idler bush (Y or Z ) **)
TG GS2-25
TG GS3-32
TG GS6-40
TG GS15-50
TG GS23-65
TG GS58-80
TG GS86-100
TG GS185-125
The extra clearances are realised as follows:
Rotor and Idler:
Pump cover:
Idler pin / bush bearing; 2 cases are possible: (standard = 1)
A.0500.501 – IM-TGGS/05.01 EN (03/2013)
C0 (µm)
C1 (µm) C2 (µm)
axial clearance
normal = 2.2 x C1
pc set minimum
1xxx 1xxx
x1xx x1xx
xxx0 xxx1
35 107
35 107
40 125
52 160
56 170
66 200
72 220
85 255
C1 (µm)
By extra machining of outside diameter (code 2, 3);
or standard = 1
By adjusting during assembly (code 0, 2 , 3);
or 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).
C3 (µm)
= 3 x C1
2xxx 3xxx
x2xx x3xx
xxx2 xxx3
235 320
235 320
275 375
350 480
375 510
440 600
480 660
560 765
C2 (µm) C3 (µm)
normal = 2 x C1 = 3 x C1
xx1x xx2x xx3x
xx1x xxYx xxZx
90 180 270
90 180 270
110 220 330
150 300 450
160 320 480
240 480 720
275 550 825
325 650 975
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