1980/03/24 Caterpillar


An Increase In Engine RPM Will Extend Vanes In Hydraulic Oil Pump To Start Pump Output{5055,5068}

Usage:




All Caterpillar Machines Equipped With Vane-Type Vickers Hydraulic Oil Pumps

During cold weather, many machine operators start an engine and let it operate at low idle rpm to warm up before starting to work. Some times the operator will try to move the implement while the engine is still operating at low idle, but the implement does not move.

This is a normal condition when the oil is cold and thick. Because the engine rpm is low, the vanes in the hydraulic pump do not extend and there is no hydraulic oil flow.

After the engine oil pressure is acceptable, increase the engine rpm to approximately 1500 rpm. Operate the engine at this rpm for at least two minutes. This will extend the vanes and start the hydraulic oil flow.

Now the implement can be moved.

Caterpillar Information System:

1980/03/24 New Fuel Injection Lines And Clamps Prevent Stresses And Contact Which Can Cause Leakage{1252}
1980/03/24 Visual Inspection Of Main And Connecting Rod Bearings{1203,1219,1230}
1980/03/24 Different Water Temperature Regulators Now Used To Prevent Overheating{1355}
1980/03/24 8S2252 Carbon Seal Tool Can Be Adapted For Use On 8N7001 Fuel Nozzle Assembly{0611,1254}
1980/03/24 New Top Piston Ring Has Plasma-Coated Face{1215}
1980/03/24 Crankshaft Rear Seal And Wear Sleeve Are Now Serviced As A Group Instead Of Separate Parts{1161}
1980/03/24 Inspect Regulator Cover Assembly When Overcooling Is A Problem{1350,1380}
1980/03/03 Fuel Heaters Are Now Available For Field Installation{1296}
1980/03/03 Connecting Rod Changes And Replacement Information{1218}
1980/03/03 Spacer Plate Block Group Used For Parts Service Of Block Group With Counterbore Design{1101,1201}
1980/02/25 Identification Of Fuel Injection Lines And Nozzle Bodies For Different Combustion Systems{1252,1254}
1980/02/25 Drawings Available For Six Tools Used During Repairs Of Damaged Pin Bores In Two-Piece Booms{6501,0665}
1980/03/24 New Plugs And Rubber Stoppers For Machines With Sealed And Lubricated Track{4169,4170,4175,0622}
1980/03/24 New Control Valve Body{1155,1159}
1980/03/24 Different Vibration Damper Now Used{1205}
1980/03/31 Use The 6V200 Hydraulic Wrench To Get Correct Torque Applications On Fasteners In Difficult Access Areas{0612,0623}
1980/03/31 6V2023 Flow Check Adapter Group Is Available{0651,0654}
1980/03/31 Replacement Pinion And Output Gear Available For Service Of Torque Multiplier{0614}
1980/03/31 Remanufactured Short Blocks Are Available For Repairs Of Early 3406 Engines{1201,1101,1102}
1980/03/31 Caution: Outboard Bearing Must Be Removed From Extended Shaft Of Front Power Takeoff Before The Engine Is Moved{3055}
1980/03/31 Use Correct Cord Assembly With Jacket Water Heaters{1383}
1980/03/31 Modification Of 5P1768 Pointer Assembly Necessary For Use On Some Fuel Injection Pump Housings{1253,0653}
1980/03/31 New Liner Seat Insert For No. 1 And No. 4 Cylinders Of D353 Engines{1217}
1980/04/14 Repair Parts Now Available For 5S2801 Hose Press Group{0624}
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