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3-1-618 Page 27
SECTION 4
REBUILDING DATA, RUNNING CLEARANCES and TORQUES
REBUILDING DATA FOR GD-250 MODEL PUMPS
PUMP STROKE
5 Inches
127 mm
Eccentric Throw Diameter
10.4930 / 10.4915
266.522 / 266.484
Eccentric Shaft Diameters:
Extension End (Drive Side)
3.875 / 3.874
98.425 / 98.400
Rotary Union End (Off Drive Side)
3.9388 / 3.9379
100.046 / 100.023
Distance Between Main Bearings
21.000 / 21.010
533.400 / 533.654
Bore in Housing for Main Bearing:
Extension End (Drive Side)
8.4657 / 8.4646
215.029 / 215.001
Rotary Union End (Off Drive Side)
8.4657 / 8.4646
215.029 / 215.001
Connecting Rod Centers
13.5
342.9
Bore in Connecting Rod Bushing for
Crosshead Pin
2.0015 / 2.0020
50.838 / 50.851
Bore in Connecting Rod Bushing for Eccentric
10.499 / 10.505
266.675 / 266.827
Crosshead Pin Diameter
2.0005 / 2.0000
50.8127 / 50.8000
Bore in Crosshead for Pin
2.0010 / 2.0015
50.8254 / 50.8381
RUNNING CLEARANCES - ACTUAL*
Connecting Rod Bearing to Eccentric
.007 / .0145
.1778 / .3683
Crosshead Pin to Bushing
.0005 / .0020
.0127 / .0508
Crosshead to Frame - at Crosshead Upper Edges
.006 / .010
.1524 / .254
Eccentric to Connecting Rod Bushing
.007 / .015
.1778 / .3810
* Feeler gauge clearances .001 inch or .25 mm less than actual values.
RECOMMENDED TORQUES
Foot-Pound Newton-Meters Foot-Pounds Newton-Meters
(Dry) (Dry) (Wet) (Wet)
Cylinder to frame stud nuts (1-1/4-7 UNC) 1820 2468 1360
1844
Suction flange Screws (5/8-11 UNC) 220 300 170
230
Discharge flange Screws (3/4-10 UNC) 420 570 320
434
Crosshead Pin Set Screw (1/2-13 UNC) 110 150
80
108