1988/01/04 Caterpillar

Checking Engine Power With A Power Take-Off (PTO) Dynamometer{3107}

Usage:

Challenger 65 Tractors ( 7YC)

Some dealers have conducted power take-off (PTO) dynamometer tests on Challenger 65 Agricultural Tractors to address low power complaints. After testing, it was found that PTO horsepower did not meet the specifications listed in the Challenger 65 sales specification sheet, Form AEHQ2738.

It is very important that rated PTO horsepower be checked at 1000 PTO rpm. The sales specification sheet incorrectly states that 1000 PTO rpm occurs at rated engine speed (2100 engine rpm). 1000 PTO rpm actually occurs at approximately 2055 engine rpm.

This can be confirmed on tractors equipped with the optional Performance Monitor by using the PTO rpm feature to set the governor control and to set the PTO at 1000 rpm. The tractor is rated at 235 PTO horsepower at 1000 PTO rpm. If PTO power is checked at 2100 engine rpm, a lower value will be found (approximately 225 horsepower).

Caterpillar Information System:

1988/01/04 Part Numbers For Bulk Lengths Of Decal Stripes{7557}

1988/01/04 Be Sure To Follow Correct Procedure When Checking Transmission Primary Clutch Pressures With Transmission Installed In Machine{3150}

1988/01/04 New Differential Spool Prevents Shift Hesitation In Power Shift Transmissions{3152,3167}

1978/12/18 Caution: Do Not Change Orifice In Water Outlet Of Auxiliary Pump Group{1371}

1978/12/18 The FT530 Puller Now Can Do The Work Of Three Pullers{0621}

1978/12/18 Longer Bolts Are Now Used To Fasten The Engine Fan Assembly To The Adapter{1356}

1978/12/18 Specifications For Adjustment Of Bearings On Rear Axle Changed{3270}

1978/12/18 Improved Cylinder Head Gasket Now Used{1101,1201}

1978/12/11 New Electric Service Meter Used{7480}

1978/12/11 New Piston Groups Use Keystone-Type Piston Rings And Have Improved Design Of Valve Pockets{1214,1215}

1978/12/11 New FT1417 Alignment Tool Available For Transmission Carrier Assembly{0622,3150}

1978/12/04 90° Elbow Added To Air Cleaner Group To Prevent Damage To The Air Filter Service Indicator{1051,7452}

1988/01/04 8T3110 Gauge Assembly And 8T3111 Ring Gear Installer Available{0722}

1988/01/04 New Front Suspension Cylinder Assemblies And Relief Valve For Suspension Control Valve Used{7201,7214}

1988/01/04 New Hose Assembly Used In Chassis Brake Control Group{4257}

1988/01/04 New FT2253 Cable Assembly Drawing Available For Kent-Moore Fuel Injection Test Bench{0782}

1988/01/04 Preparing Service Reports For Paving Products{0336,0370,8100,8200}

1988/01/04 Optional Spray Nozzles Available{8227}

1988/01/04 Stronger Drive Plate And Longer Mounting Bolts Used In Drum Mounting Assembly; New Gear Box Mount Used In Propel System{8227}

1988/01/04 New Breather For Pump Drive Gear Box Is Remotely Mounted{3279}

1988/01/04 Shorter Vee Belts Will Increase Clearance Between Alternator And Engine Side Panel{1357}

1988/01/04 Die Cast Flywheel Housing Has Less Weight{1157}

1988/01/25 Improved Radiator Core Assemblies Used In Folded Core Radiators {1353}

1988/01/25 Suction Screen Added Inside Sump Fuel Tank {1273,1274}