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Case 621B, 721B Loaders Workshop Repair & Service Manual
1,860 pages, bookmarked, Searchable, Printable, high quality PDF
621B, 721B Loaders Service Manual.pdf
621 B 6T-590; 721 B 6T-830
Complete digital official shop manual contains service, maintenance, and troubleshooting information for the Case 621B, 721B Loaders. Diagnostic and repair procedures are covered in great detail to repair, maintain, rebuild, refurbish or restore your Case 621B, 721B Loaders like a professional mechanic in local service/repair workshop. This cost-effective quality manual is 100% complete and intact as should be without any missing pages. It is the same factory shop manual used by dealers that guaranteed to be fully functional to save your precious time.
This manual for Case 621B, 721B Loaders is divided into different sections. Each section covers a specific component or system and, in addition to the standard service procedures, includes disassembling, inspecting, and assembling instructions. A table of contents is placed at the beginning of each section. Pages are easily found by category, and each page is expandable for great detail. It is in the cross-platform PDF document format so that it works like a charm on all kinds of devices. You do not need to be skilled with a computer to use the manual.
EXCERPT:
STEP 80
Measure the cylinder sleeve bore for taper as follows:
1. Measure the bore parallel to the crankshaft at the top end of the ring travel zone.
2. Measure the bore in the same position at the bottom end of the ring travel zone.
3. Measure the bore at right angles to the crankshaft at the top end of the ring travel zone.
4. Measure the bore in the same position at the bottom end of the travel zone.
Compare the results of the measurements (1) and (3) with (2) and (4), to find out if the bore has taper. To measure use a inside micrometer, bore gauge or taper gauge. If the taper is more than 0.04 mm, the cylinder sleeve must be replaced.
STEP 81
Measure the cylinder sleeve bores for out-of-round as follows:
1. Measure the bore parallel to the crankshaft at the top end of the ring travel.
2. Measure the bore in the same position at the bottom end of the ring travel.
3. Measure the bore at right angles to the crankshaft at the top end of the ring travel.
4. Measure the bore in the same position at the bottom end of the ring travel.
Compare the measurements (1) and (3) to find the outof-round wear at the top end of the bore.
Compare the measurements (2) and (4) to find the outof-round wear at the bottom of the bore.
If out-of-round is more than 0.04 mm, the cylinder sleeve must be replaced.
Removing the Cylinder Sleeves
IMPORTANT: Cover the crankshaft journals with a clean cloth. Foreign material from the cylinder sleeve or the cylinder block will cause damage to the crankshaft.
STEP 82
Install a sleeve puller to remove the cylinder sleeve. Position the puller in the sleeve. Make sure that the jaws of the puller do not contact the four block lugs. Tighten the lock bar against the cylinder sleeve.
IMPORTANT: Make sure that the jaws of the sleeve puller do not contact the block lugs.
STEP 83
Carefully turn the bearing nut until the cylinder sleeve is loose from the cylinder block.
STEP 84
Remove the cylinder sleeve from the cylinder block.
Remove the a-ring from the cylinder sleeve.
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