Table 4-3. Clearance Limits

MAINTENANCE OF THE MUD PUMP - cont - TM-5-3820-256-24-1_75

TM-5-3820-256-24-1 Drilling System Manual
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n. Install screws in puller holes of housing (98) and pull housing (98), with jackshaft and bearings assembled, from the mud pump frame. Remove gasket (99). o. Remove locknut (96), lockwasher (97) and outer bearing cone (100), then pull jackshaft (103) from housing (98). Remove bearing cup (101) inner bearing cone (100) and seal (102). Remove bushings (104) from jackshaft (103). 4-5.2.2 Inspection and Repair. a. Examine the bushings (79, 80) for excess wear. Refer to table 4-3 for wear limit. b. Install the crossheads (78) in the slide (bore) and check clearance. Refer to table 4-3 for limit. NOTE Oversize crossheads (.010 in.) may be installed if crosshead slide is rebored. In case of excessive bore size, the pump may be returned to factory for sleeving. c. Inspect and replace all worn parts. Always install new seals at assembly. Table 4-3. Clearance Limits COMPONENT PART LIMIT 1. Eccentric Bushings a. Good Condition .006"-.015" b. Worn out .030 or making noise 2. Crosshead Bushings a. Good Condition .0005"-.001" b. Worn out .007" or making noise 3. Crosshead to Slide a. Good Condition .010"-.017" b. Worn out .060" or making noise 4-5.2.3 Assembling Power End. a. Install bushings (79,80) in connecting rod (81). Assemble crosshead (78) to connecting rod and install pin (77), screws (76) and lockwire (75). b. Assemble connecting rods on eccentric sprocket (74) and install retainers (91), screws (76) and lockwire (75). Attach a hoisting device to the sprocket and lift it into place in the mud pump frame. c. Remove the masking tape holding key (82) in place. Install bushing (72) and bearing cone (71) on shaft (67). Install seal (73) in bore of mud pump frame. d. Orient the shaft (67) so that the key (82) is aligned with keyway in sprocket (74). Install the shaft (67) in sprocket (74). Install seal (70). e. Install bushing (69) and bearing cone (68) by tapping with a soft hammer. (Sometimes it will simplify the bearing installation if it is heated in oil to expand it.) Remove hoist from sprocket. 4-45

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