O-RING 0998229 - Caterpillar

Inspect
Illustration 1 g01177184Inspect each tooth of the chain tool for wear. Replace the teeth, if necessary. Ensure that the bolts for each tooth are tightened.Replace Teeth
Illustration 2 g01030154Perform the following procedure on one chain link and remove the chain tooth from the chain assembly.
Remove nuts (2).
Remove bolts (3) and remove tooth (1). Retain brackets (4) and retain spacers (5), as required. Note: Ensure that you replace the worn tooth (1) with an identical tooth. Replace worn components or damaged components with new hardware.
Replace the chain tooth. Install the hardware in the proper order. Replace Chain
Perform the following steps in order to replace the chain from the trencher.
Illustration 3 g01032127
Use a wrench with "18 MM" box end and remove four clamp bolts (1) and nuts (2).
Remove bolt (4).
Move the idler inward in order to increase slack in the chain.
Remove the chain from the trencher.
Remove idler (9) from boom (8). Remove drain plug (3) and remove purge valve (5).
Pull pushrod (7) and remove the adjuster cylinder (6) from boom (8).
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Push pushrod (7) back into adjuster cylinder (6) in order to drain the grease. Note: After drainage, insert a new purge valve. Use "Teflon" tape on the threads.
Install adjuster cylinder (6) into boom (8). Make sure that purge valve (5) aligns with the hole for drain plug (3).
Install new bolt (4).
Install idler (9) into boom (8). Replace clamp bolts (1) and nuts (2) into the original position.
Install the chain on the trencher.
Apply grease to the purge valve in order to adjust the chain tension so that the distance (A) between the inside of the chain to the bottom of the boom should be approximately 68.5 mm (2.50 inches) for the T9B and T15B trenchers. The distance (A) between the inside of the chain to the bottom of the boom should be approximately 38 mm (1.50 inches) for the T6B trencher.
Hold clamp bolts (1) with the "18 MM" box wrench while you tighten the nuts (2).
Torque the four nuts (2) to 100 N m (73.75 lb ft). Continue to torque all four nuts in order to ensure that all four nuts are evenly torqued to 100 N m (73.75 lb ft).
Use a "One Inch" box wrench to replace drain plug (3). Note: A new chain stretches more readily than a chain with more usage. Adjust the chain, if necessary.Chain Groups
Chain groups are available with different configurations of teeth . Chain groups are available in several widths. Refer to Service Manual, RENR4457, "Trencher Tooth" for additional information on replacing chain groups or replacing the entire chain.Single Standard
A single standard chain group has standard cup teeth