New Precharge Pressures For Trucks With Two Steering Accumulators{4331}
Usage:
789B (7EK),
793 (3SJ),
793B (1HL) Trucks
Description of Change: The number of accumulator groups per truck has been reduced from three to two. In order to have the same volume of oil in the accumulators for steering, the accumulator precharge pressure must be reduced.
Adaptable To:
See the chart for the new pressures. This change is effective with 789B (7EK1), 793 (3SJ39) and 793B (1HL1) Trucks.
NOTE: It is recommended that the precharge pressure on trucks with two accumulators be checked every 1000 hours to assure that they never drop below the minimum pressure shown in the chart. Precharges below these minimum pressures could damage the accumulator bladder.
Caterpillar Information System:
1993/11/01 New Thicker Front Wheel Castings Are Used To Increase Wheel Life{4201}
1993/10/25 New Bracket Replaces Heat Shield In Turbocharger Support Group For Additonal Strength{1050,1073}
1993/10/25 New Clips With Grommets Used On Large Water Lines Prevents Wear{1380}
1993/10/25 Pre-Strikeoff Plates With Angled Deflector Available For VIP Screeds{6646}
1993/10/25 Stronger Drive Chains Available For Parts Service{3261}
1993/10/25 Heavy-Duty Seal Kit Availble For Servicing Brake Calipers{4256,4250}
1993/10/25 Change In The Assembly Procedure Of The Damper In The Parking And Service Brake Group Provides Greater Reliability{4151,4267}
1993/10/25 New Fan Guards Used In Suction Fan Group{1360}
1993/10/18 Longer Bolts Required With New Spacer Block {1124}
1993/10/18 New Cylinder Head, Spacer Block, And Head Gasket Available {1101,1124,1221}
1993/10/18 24V Fog Lamp Now Available {1400}
1993/10/18 Curved Profile Nosing Bars Are Now Used With The VIP Screed {6643}
1993/11/01 Serviceable Parts Available For Tilt Cylinder Load Control Valve Groups{5104,5117,5123,5127}
1993/11/01 Serviceable Parts For Water Spray Pump{5614}
1993/11/01 High Pressure Wash Kit Replaces High Pressure Pump To Improve Service Life{5614}
1993/11/01 Check Valves Now Used In Hydraulic Steering Circuit To Prevent Steering Kickback{5067}
1993/11/01 Sealant Replaces A Gasket In Oil Pan Groups{1302,7555}
1993/11/09 Effort Needed To Depress And Hold The Foot Accelerator Pedal Can Be Reduced{1265,1250}
1993/11/09 Rear Axle Lubricant Now Being Offered{3278}
1993/11/09 Improved Window Seals And Sealing Procedure Used On Most Caterpillar Machines{7300,7310}
1993/11/09 New Cylinder Block Groups Have Additional Material Added To The Camshaft Bore Area{1201}
1993/11/15 Engine Overheating May Be Caused By Paint Plugging Radiator Core {0771,1000,1374}
1993/11/15 Early Hour Maintenance For The B-Series Extendable Stick {6833}
1993/11/15 Radiator Shroud Assembly Has Slots To Make Removal Easier {1381}