HOSE 1421935 - Caterpillar

Grind the rod to finish size. Use a Norton No. 32-A-80-1CS-VBE or similar aluminum oxide, 80 grit vitrified bond grinding wheel. Use a large amount of cutting fluid, either heavy-duty synthetic or light soluble oil. Use wheel speeds of 1980 to 2590 surface meters per minute (6500 to 8500 surface feet per minute) and a medium to high work speed to prevent heat damage. Plunge-grind all high points first, and then traverse-grind to finish size with a maximum stock removal of 0.05 mm (0.002 inch) per pass.
Polish the rod to a surface finish of 0.4 Ra µm (16 Ra microinch) to 0.8 Ra µm (32 Ra microinch). Use a 220 grit abrasive belt.Miscellaneous Salvage Welding
Salvage of a Broken Trunnion
Weld the broken piece into place, and build up the bearing surfaces with weld. Then, machine the inside of the bore.
Illustration 105 g01253237
Broken piece from the trunnion has been welded back into position.
Do not salvage broken lift cylinder trunnions on any scraper bowls, wheel loaders, or track loaders. These trunnions are heat treated for strength, and welding will destroy this special characteristic.
Salvage of Damaged Cylinder Rod Ends
Build up the damaged cylinder rod end with weld. Then, machine the diameter and recut the thread.
Illustration 106 g01253249
Salvage of the piston end of the cylinder rod.
Illustration 107 g01253251
Salvage of the piston end of the cylinder rod.
Salvage of Damaged Cylinder Assembly Ends
Build up the damaged cylinder end with weld. Then, machine the bore to original size.
Illustration 108 g01253254
Salvage of the tube. Build up the end with weld (only the end of the tube was damaged).
Illustration 109 g01253255
Same cylinder tube as the tube shown in Illustration 108 after the tube has been machined to size.
Reconditioning check valve seat of Truck Strut Rods
At truck strut rebuilds inspect the seat of the internal check valve on the front suspension rod. This check valve is set up as an internal cushion and can have erratic actuation depending on conditions.Conditions such as bad haul roads, overloading, or under charged struts can cause the check ball to strike against check valve seat. This can cause seat damage and allow oil to bleed past check valve.If any damage is visible upon inspection, reface valve seat to 30°
Illustration 110 g06037118Machine the valve seat to clean up any damage, minimizing the depth to allow for multiple repairs. Machining depth depends upon damage. Maximum machining depth of 1.5 mm for 40 ton through 100 ton. Maximum machining depth of 3.0 mm for 130 ton through 400 ton. Only machining until the valve seat is cleaned up should allow for more machining to be done on next rebuild.Note: Mark repair depth of check valve on top of rod in between bolt holes. This will easily identify check valve depth at next rebuild. Indicate with an engraving tool the depth in mm that the check valve was taken to. Example R26.5 for taking 1.5 mm off the check valve seat.Equipment Suppliers
Surface Finish Analyzers
Taylor Hobson Ltd
PO BOX 36
2 New Star Road
Leicester, LE4 9JQ England
www.taylor-hobson.com
Tel: (0) 166 276 37, Fax: (0) 116 246 0579
United