Excessive Wear And Breakage Of 124-6639 Thrust Plate In 125-3427 Pump Drive Group (HEUI Hydraulic Pump Drive)
Usage:
ENGINES
3412E (4CR) INDUSTRIAL ENGINES;
D9R (7TL, 8BL),
D10R (3KR) TRACK-TYPE TRACTORS;
24H (7KK) MOTOR GRADERS;
631E (1AB),
633E (2PS) 637E (1FB),
651E (4YR),
657E (, 5YR, 6PR, 6TR, 7KR) WHEEL-TRACTOR SCRAPERS;
769D (5TR),
771D (6JR),
773D (7ER),
775D (6KR) OFF-HIGHWAY TRUCKS;
834B (7BR) WHEEL TRACTORS;
836 (7FR) COMPACTORS;
988F (2ZR),
990 (4FR) WHEEL LOADERS;
5110 (7GN8HN) EXCAVATORS;
PM-565 (3TK) COLD PLANERS
COMPACTORS
MOTOR GRADERS
OFF-HIGHWAY TRUCKS
TRACK-TYPE TRACTORS
WHEEL LOADERS
WHEEL TRACTORS
WHEEL-TRACTOR SCRAPERS
PAVING PRODUCTS
3408E (7PR),3412E (4CR) INDUSTRIAL ENGINES;
D9R (7TL, 8BL),
D10R (3KR) TRACK-TYPE TRACTORS;
24H (7KK) MOTOR GRADERS;
631E (1AB),
633E (2PS) 637E (1FB),
651E (4YR),
657E (, 5YR, 6PR, 6TR, 7KR) WHEEL-TRACTOR SCRAPERS;
769D (5TR),
771D (6JR),
773D (7ER),
775D (6KR) OFF-HIGHWAY TRUCKS;
834B (7BR) WHEEL TRACTORS;
836 (7FR) COMPACTORS;
988F (2ZR),
990 (4FR) WHEEL LOADERS;
5110 (7GN8HN) EXCAVATORS;
PM-565 (3TK) COLD PLANERS
Problem:
There have been reports of the 124-6639 Thrust Plate cracking and breaking. This thrust plate is part of the 125-3427 Pump Drive Group. If the thrust plate cracks of breaks, the engine may log speed sensor faults and/or the engine may not run.
Solution:
A change is forthcoming. In the interim, continue to use the 124-6639 Thrust Plate (1). Continue to use the two 0S-1617 Bolts (2), but replace the two former 9M-1974 Hard Washers (3) with two new 9N-0869 Hard Washers (3)
124-6639 Thrust Plate (1). 0S-1617 Bolts (2). 9N-0869 Hard Washer (3). 
125-3427 PUMP DRIVE GROUP
COPYRIGHT 1997 CATERPILLAR ALL RIGHTS RESERVED
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