1977/03/07 Caterpillar

Relief Valve Added To Lubrication And Testing Group For Sealed And Lubricated Track{0651,0671,4175}

Usage:

A relief valve has been added to the 5P2420 Lubrication and Testing Group used to test assembled track joints during addition of lubricant to Sealed and Lubricated Track. The relief valve gives protection to the 5P2707 Gauge from large pressure surges (sudden increase and decrease in pressure). Large pressure surges can decrease the service life of the gauge.

Illustration 1. 5P2420 Lubrication and Testing Group.

Illustration 2. Dimensions to drill hole in drum cover.

The relief valve can be installed on earlier lubrication and testing groups that did not have a relief valve. A 5P6578 Valve Assembly and a 5P6559 Block are needed for installation of the valve.

Installation:

1. Remove the junction block from the lubrication and testing group.

2. Remove the pump assembly and drum cover from the drum. Drill a hole in the drum cover as shown in Illustration 2. Install the pump assembly and drum cover to the drum.

3. Install the 5P6578 Valve Assembly in hole A (Illustration 3) of the 5P6559 Block.

Illustration 3. New valve assembly and block.

4. Install the 5P6578 Valve Assembly on the lubrication and testing group with the 5P6578 Valve Assembly in the new hole in the drum cover. Assembly hoses and fittings which were removed earlier.

Caterpillar Information System:

1977/02/28 Changes To Retainer Nut Torque And Assembly Procedures For Turbocharger Compressor Wheels{0374,1052}

1977/02/28 Improved Exhaust Valve Now Available{1105}

1977/02/28 Lock Now Available For Connecting Rod Bolt Used In TU-FL0501 Air Compressor{1065}

1977/02/28 Clip Now Used To Hold Coolant Line For The Turbocharger{1052,1380}

1977/02/28 Hardened Washers Now Used Between The Bolt Heads And The Engine Front Support To Keep These Bolts Tight{1153}

1977/02/28 Modification To Holder To Machine Counterbore On Cylinder Block{0664,1201}

1977/02/14 Diesel Fuel Recommendation Expanded{1280}

1977/02/14 Test Used Fuel Nozzles Before You Install New Nozzles; Tips On Test Procedures{1254,0651,0336}

1977/02/14 New 5P7307 Engine Turning Tool Group Fits All Engines{0611}

1977/02/14 Correct Use Of Plugs In Drain Holes Of Hydraulic Pumps That Have Two Seals On The Shaft-Use A Plug In Drain Hole Except With Water Glycol Systems{5055,5073}

1977/01/31 Low Emission Truck Engines With Exhaust Gas Recirculation (EGR) Systems{1050}

1977/01/31 Transportation Notice Plate Is No Longer Needed For Pressurized Nitrogen Cylinders{7557}

1977/03/07 Improved Shut-Off Solenoids For Engines Equipped With Sleeve Metering Fuel Systems{1259}

1977/03/07 Drains In New Fuel Injection Pump Housing And Governor Housing Prevent Possible Corrosion And Freezing Damage{1286}

1977/03/07 Use Insert To Repair Bearing Seat In Water Pump Housing{1361}

1977/03/07 Cooling System Orifice Changed For Better Flow Control And Air Removal{1380}

1977/03/21 New Spring Used In Fuel Ratio Control{1278}

1977/04/11 New Retainer And Improved Housing Keep Water Pump Bearing Tight; Repair For Loosened Bearing{1361}

1977/04/11 Improved Mounting For Expansion Tank{1354,1379,1380}

1977/04/11 New Shaft Assemblies Used For Forward And Reverse Clutch And Stronger Nipple Used At Oil Pump{3302,3306,3307,3310,3314}

1977/04/11 New Diaphragm Used In Brakesaver Control Valve{1159}

1977/04/18 Tools To Remove Wear Sleeves From Crankshafts{0621,7558}

1977/04/18 New Crankshaft Front Seal And Wear Sleeve Permit Crankshafts With Seal Wear To Be Used Again{1151,1160}

1977/04/18 Stronger Material Used In Undersize Connecting Rod Bearings{1219}