1981/11/30 Caterpillar

New Spacer; New Shaft Assembly Permits Pressure Lubrication Of Sun Gear{3304,3307}

Usage:

7251 And 7261 Marine Transmissions

Description of Change: A new shaft assembly is used in the planetary group on the 7251 and 7261 Marine Transmissions. The design of the new shaft assembly permits pressure lubrication of the splines on the shaft and the sun gear.

Also, a new spacer and washers are used in the lower shaft group. The new parts will hold the preload on the sun gear retainer bolt.

Formerly, there have been problems with too much wear of the splines on the former shaft assembly and the sun gear. This has been caused by not enough lubrication and axial movement of the sun gear.

Adaptable As: The new parts are direct replacements for the former parts as shown in the chart. The new parts are in effect with Serial Numbers 74E2405 (7251) and 89B732 (7261).

Location of spacer and washer in lower shaft group.

Caterpillar Information System:

1981/11/30 New Tube And Cover Assembly Make Service Easier{3300,3306}

1981/11/30 New Duo-Cone Seals Use Seal Rings Made Of Steel Instead Of Cast Iron{7555}

1981/11/23 Plate Added To Hold Oil Lines In Adapter For Left Side Oil Filter{1306,1307}

1981/11/23 New Regulator And Field Coil Assemblies Used{1410,1405}

1981/11/23 Use Of Metric Fasteners{7553,0683,1000}

1981/11/23 New 6V4190 Auto Programmer Group And 6V4865 Auto Programmer Connector Used With 6V2100 Multitach{0651}

1981/11/16 Locating Special Instructions Quickly And Easily Using Microfiche{0374}

1981/11/16 New Inlet And Exhaust Valves, Valve Guides Have Tighter Fit To Prevent Corrosion, Guide Wear{1104,1105,1101,1103,1108,1109}

1981/11/16 Improved Element Assemblies Used In Jacket Water Heaters{1383}

1981/11/16 New Shaft Assembly Used In Flexible Coupling Arrangement{3303}

1981/11/16 Check Bottom Surface Of Cylinder Liner Flange For Erosion And Wear{1216,1201}

1981/11/09 New Clearance Specifications For Oil Pump Rotor Tip{1304,0374}

1981/12/07 Do Not Use "V" Mark As Reference To Install Pistons With Keystone-Type Rings{1214,1215}

1981/12/07 New Air Cleaner Group Has Six Clamps For Improved Seal{1051}

1981/12/14 Make Sure Coolant Conditioner Elements Are Changed At Correct Intervals{1350}

1981/12/14 How To Remove The 7L4511 Sleeve Assembly From Aftercoolers{0620,1063}

1981/12/14 New Springs For Timing Advance Used In Governor And Fuel Pump Drive Group{1272,1288}

1981/12/14 New Cylinder Liners And O-Ring Seals Give Longer Seal Life{1216,1201,1213,1227}

1981/12/21 Use Of A Flex-Hone For Cylinder Liner Reconditioning{0664,0674,1216}

1982/01/11 Improvements And Test Procedures For Hydramechanical Shutoffs{7418}

1982/01/11 Check 14 Test Points In Less Than 5 Minutes With The 6V2150 Starting/Charging Analyzer Group{0651,1518,1406}

1982/01/11 Improved Head Gasket Has Larger Fire Ring To Decrease Fretting{1101,1201}

1982/01/11 Procedure Reduces Possibility Of Spraying Hot Hydraulic Oil When S.O.S. Sample Is Taken{0372,5068}

1982/01/11 Use Improved Start Switch In Most Applications{1416}