1983/10/17 Caterpillar

Installation Of Vent Assembly Helps Prevent Oil Leakage In The Wheel Leaning Mechanism{5224}

Usage:

120B ( 64U, 32C );
140B ( 61S, 33C ) Motor Graders

Description of Change: A vent assembly is now used in the front axle group on 120B and 140B Motor Graders.

Reports show that oil leakage past the seal in the wheel leaning mechanism can be caused by an increase of pressure inside the worm gear housing. The vent assembly will release the pressure.

Adaptable To: The 5F5434 Vent Assembly is adaptable to all earlier 120B and 140B Motor Graders. It is in effect on 120B Motor Graders with Serial Numbers 64U8265 and 32C915, and 140B Motor Graders with Serial Numbers 61S1036 and 33C304.

To install the vent assembly on earlier machines, it will be necessary to drill and tap a hole in the 2F8000 Worm Gear Housing Cover. See the illustration for the location of the hole.

Location of tapped hole in cover of worm gear housing.

Caterpillar Information System:

1983/10/17 Fan Drive Conversion Group Available To Change Fans From Gear Driven To Belt Driven{1359,1356}

1983/10/17 Broken Edge Filter Or Plugged Cylinder Head Adapter Can Cause Rough Engine Operation Or Low Power{1252}

1983/10/10 Cab Head Lamps Mounted In New Location For Better Protection{7309}

1983/10/10 New Water Pump Oil Seal Prevents Leaks{1361}

1983/10/10 New Service Centers For 6V3100 Engine Timing Indicator Group{0651}

1983/10/10 New Connecting Rod And Main Bearings Used{1203,1219,1226,1227,1230}

1983/10/10 S.O.S Program Synopsis{1318,5068,3179,0652}

1983/10/03 Use 6V6070 Tool Group And New Adjustment Procedure For New Scroll Fuel System{0654,1264,1278}

1983/09/26 New Seals Used In Tandem Drive Group{4064,4062,4071}

1983/09/26 Clearance Between Boom And Upper Frame{6501}

1983/09/26 New Drawbar And Yoke Assemblies Have Stronger Cross Bar To Prevent Damage{6153}

1983/09/26 Product Identification Number To Replace Serial Number On Earthmoving Equipment{7557}

1983/10/17 New Rod And Seal Used To Prevent Oil Leakage Into The Transmission Neutralizer Group{3181}

1983/10/17 Instrument Panel Changed To Give Better Fit For Gauges{7451}

1983/10/17 Modification Of Control Panel Gives Different Power Source For Overcrank Timer To Prevent Starter Motor Failures{7450}

1983/10/17 Stronger Spider Assemblies Used In Fan Groups{1356}

1983/10/17 Changes To Torque Converter Inlet Relief Valve Increase Service Life{3167}

1983/10/17 If The Cab Door Is Difficult To Open, Check Nylon Washer For Damage{7308}

1983/10/17 Use Shims At Both Ends Of Housing Assembly To Prevent Oil Leakage From Power Control Group{5201}

1983/10/17 New Rod Ends And Supports Used In Hydraulic Control Groups{5452}

1983/10/17 New Pump Drive Gear And Shaft Have More Clearance{3101,3108}

1983/10/17 Remanufactured Fuel Pump And Governor Groups{1251,1264}

1983/10/17 Valve Damage Can Be Caused By Short Intervals Of Engine Operation In Very Cold Temperatures{1105,1208}

1983/10/24 FT1782 Turbocharger Test Stand Available{0651,1052}