Opening of Bids - One (1) or More New Positive Displacement Hydro-Excavating Machine with Tandem Axle Cab & Chassis Spec U - Best Equipment Co., Inc.

Home Browse Search

plate will separate from the cylinder. The lip seals (27) and bearings (16) are removed with the headplate and can be pressed out later. 8. Remove the sleeve (28) from the shaft with the aid of a bearing puller by inserting the puller jaws in the groove in the sleeve and applying the jacking screw against the end of the shaft. Protect the threaded hole and the end of the shaft with a flat spacer between the shaft and the puller. 9. Remove the sealing rings (28) by inserting a thin, pointed tool at the gap to lift one end over the other so it springs free. 10. Remove plates and sleeve used to block shafts on drive end Fig. 8. DISASSEMBLY OF DRIVE END 1. Drive end headplate removal — Remove all capscrews (23) holding the headplate. Insert jacking screws into the four threaded flange holes and turn them in evenly. The headplate will separate from the cylinder. The lip seals (27) and bearing outer race and rollers are reinoved with the headplate and can be pressed out later. 2. Remove the bearing inner race and the sleeve from the shaft as mentioned previously. Remove sealing rings. ASSEMBLY Prior to any assembly operation, it is essential that all parts are completelyclean and free from nicks and scratches. L Assembly of sealing rings (28) - The sealing ring groove in the shaft sleeve must be coated with a dry film graphite lubricant (slip plate, or equal), before install- ing the ring. To avoid scratching the lip seal surface, install the sealing rings (28) in the sleeves (38) from the end nearest the groove before assembling the sleeve on the shaft. Unhook the gap joint and expand the ring while sliding it to the groove, then compress it so one end of the hook joint slides over the other. Move the ring in the groove to be sure it is free. 2. Installation of sleeves (38) - Heat the sleeve to 300°F. (149°C) in oven then quickly slide it on the shaft tightly against the impeller. If the sleeve hangs up during assembly, it can be pressed into place using a tubular pressing tool with square, clean ends. 3. Assembly of seals (27) in headplate (1) - Place headplate flat with seal bores up. Be sure the press- ing tool face is clean and square and there is a smooth, clean entering bevel in the headplate. Lubricate the seal lips and use sealant on outer diameter. Place seal over the bore with lip facing up, then press the seal evenly until it is flush againi4 front face. 4. Assembly of impellers-(12 and 131 to headplate (2) - Place gear and headplate flat on 4 in. (100 mm) blocks with the smallest bores facing up. Inspect entering bevels to be sure they are smooth and clean. Locate the drive impeller correctly (top for vertical units and toward the driver for horizontal units.) Place the seal ring gaps toward the inlet. Insert the impeller shafts in the headplate so the impellers rest on the headplate. Use care to avoid damaging the lip seals. 5. Assembly of cylinder (11) to gear end headplate (2) - Install dowel pins (16) and secure cylinder to headplate with capscrews (23). Then, install drive end headplate (1) and dowel pins (16) and secure with capscrews (23), 6. Installation of drive end bearings (14) - Heat bearing inner race to 3001F. (149 C) in an oven or hot oil; then slide it onto the shaft so the bearing shoulder is snuggly against the sleeve. After the inner race has cooled, lubricate the rollers and insert the bearing outer race in each bore and tap lightly into place. T Installation of gear end bearings (15) - Set the blower on its feet. Lubricate the stud and install it in the end of the shaft. Install two wavy washers (29) per bearing in the bearing bore. Apply oil on bearing bore and OD, also lubricate bearing balls. Place bearing on shaft. Install sleeve and washer per Fig. 9. Lubricate nut WASHER (4-1/4" 00, 15/16" ID, 1" THICK STEEL SLEEVE (4-1/4" 00 3" ID, 3" LONG, STEEL) I 7/e-9 NUT 6" LONG, 7/e-9 STUD Figure 9 -- Gear End Bearing Installation threads and face and install it on the stud. Block the impellers per Fig. 6. Push the bearing all the way against the sleeve (38) by turning the nut. Repeat for the second bearing. 8. The end clearances are set during the installation of bearing clamp plates. Install bearing clamp plates (34) using self locking screws (32). Measure the gear end clearance; turn the screws (34) in evenly till gear end clearance per Table 5 is achieved. Rotate the impellers a few times to center the bearings and recheck end clearances. Measure clearance between the bearing clamp plate and the headplate under the screw heads. This clearance should be same under each head. Ob- tain shim (74) equal to this clearance. Insert shim (74) between clamp plate and headplate under each capscrew (32). Tighten capscrews (32). Recheck end clearances. 9. Installing driven gear - Be sure shaft taper fits and gear bores are clean and free of scratches. THE GEAR BORES AND THE SHAFT TAPER FITS MUST BE FREE OF OIL. Place hardwood wedges as shown in Fig. 6. Install oil clinger (46) on the backside of the driven gear using washer (59) and capscrew (68). Tor- que the capscrews to 25 ft-lb. These capscrews are self locking type and should be replaced during each tear down. Apply Molykote Gn Paste to gear capscrews (31), on the threads and under the heads. Molykote Gn paste is available from Bearing Distributors. Install driven gear (4), washer (30), washer (69) and capscrew (31) so that match mark at tooth is at the line of engagement. Tighten the capscrew (31) to the torque in Table 4. 12