2002/05/06 New High Temperature Buffer Seals Reduce Oil Leakage From Hydraulic Cylinders {7562} Caterpillar


New High Temperature Buffer Seals Reduce Oil Leakage From Hydraulic Cylinders {7562}
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2002/05/06 [SEPD0628]
HYDRAULIC SYSTEM
2002/05/06 New High Temperature Buffer Seals Reduce Oil Leakage From Hydraulic Cylinders {7562}
Excavator:
320 (S/N: 4ZJ1-UP; 7WK1-UP; 8LK1-UP; 2DL1-UP; 8HL1-UP; 2BN1-UP)
320 L (S/N: 3XK1-UP; 9KK1-UP; 1KL1-UP; 1TL1-UP)
320 N (S/N: 9WG1-UP; 1XM1-UP)
320 S (S/N: 6KM1-UP)
320B (S/N: 5BR1-UP; 9KR1-UP; 1XS1-UP; 8ES1-UP; 4XW1-UP)
320B L (S/N: 6CR1-UP; 7JR1-UP; 1DS1-UP; 1ES1-UP; 5CS1-UP; 9CS1-UP; 9WS1-UP; 5GW1-UP; 6LW1-UP; 2WZ1-UP)
320B N (S/N: 4NR1-UP; 2AS1-UP)
320B S (S/N: 5MS1-UP)
320B LL (S/N: 6LS1-UP; 9JS1-UP)
320B LN (S/N: 3YZ1-UP)
320B U (S/N: BAN1-UP)
320B LU (S/N: BBG1-UP)
322 (S/N: 7WL1-UP)
322 L (S/N: 8CL1-UP; 8ML1-UP; 9RL1-UP)
322 N (S/N: 9JL1-UP)
322 LN (S/N: 4RM1-UP)
322B (S/N: 8MR1-UP)
322B L (S/N: 8NR1-UP; 1BS1-UP; 1YS1-UP; 2ES1-UP)
322B LN (S/N: 1ZS1-UP)
325 (S/N: 7TG1-UP; 9SG1-UP; 5WK1-UP; 8YK1-UP; 9ZK1-UP; 8NL1-UP; 6RM1-UP)
325 L (S/N: 7LJ1-UP; 2JK1-UP; 6KK1-UP; 8NK1-UP; 2SL1-UP; 9KL1-UP; 7LM1-UP)
325 LN (S/N: 2SK1-UP; 3LL1-UP)
325B (S/N: 8PR1-UP; 8WR1-UP; ABD1-UP)
325B L (S/N: 6DN1-UP; 2JR1-UP; 8RR1-UP; 8XR1-UP; 1HS1-UP; 4DS1-UP; 5BS1-UP; 5LW1-UP)
325B LN (S/N: 8FN1-UP)
330 (S/N: 9PJ1-UP; 9WJ1-UP; 6ZK1-UP; 8RL1-UP; 2ZM1-UP)
330 L (S/N: 6SK1-UP; 8FK1-UP; 2EL1-UP; 9ML1-UP; 5YM1-UP)
330 LN (S/N: 8CK1-UP)
330B (S/N: 8SR1-UP; 4YW1-UP)
330B L (S/N: 3YR1-UP; 6DR1-UP; 8TR1-UP; 1KS1-UP; 4RS1-UP; 5LS1-UP; 3ZZ1-UP)
330B LN (S/N: 5LR1-UP)
W330B (S/N: AME1-UP)
345B (S/N: 6XS1-UP; 2ZW1-UP)
345B L (S/N: 4SS1-UP; 5WS1-UP; 7KS1-UP; 9GS1-UP; 2NW1-UP; 2SW1-UP; 3MW1-UP; 4SW1-UP)
345B LC (S/N: BFG1-UP)
345B Series II (S/N: AKJ1-UP; ALD1-UP; APB1-UP)
345B LC Series II (S/N: AGS1-UP; AKX1-UP; ALB1-UP; ALL1-UP; ALT1-UP; AMA1-UP; CDJ1-UP)
350 (S/N: 7RK1-UP; 8HK1-UP; 2ZL1-UP)
350 L (S/N: 3ML1-UP; 9FL1-UP; 8KZ1-UP)
365B L (S/N: 9PZ1-UP; 9TZ1-UP; AGD1-UP)
375 (S/N: 8XG1-UP; 8WJ1-UP; 6NK1-UP)
375 L (S/N: 6RL1-UP; 9WL1-UP; 1JM1-UP)
5080 (S/N: 6XK1-UP; 8SL1-UP)

Reference: Service Magazine, SEPD0532, 10 July 2000, "An Improved Dust Seal for Hydraulic Cylinders Increases the Service Life". This article contains additional information about hydraulic cylinder seals and seal kits.

Description of Change: A new buffer seal is used in bucket cylinders, stick cylinders, and boom cylinders. The durability of the new seal is improved. The new seal has an increased resistance to high temperature. The new seal reduces the oil leakage that is caused by excessive wear due to heat.

Adaptable To: The new buffer seals replace the former buffer seals. The new buffer seals and the former buffer seals are listed in Table 1. The new buffer seals are adaptable to the models that are listed in Table 1. The location of the buffer seal in a hydraulic cylinder group is shown in Illustration 1.

New seal kits with a new buffer seal are available for service repair of hydraulic cylinders. The new seal kits replace the former seal kits that are listed in Table 1.




Illustration 1g00814247

Location Of The Buffer Seal In A Typical Hydraulic Cylinder Group

(B) Buffer Seal

Table 1
Hydraulic Cylinder Groups With The New Buffer Seal    
Model     Buffer Seal     Seal Kit     Cylinder Group     Description    
New Part Number Former Part Number     New Part Number     Former Part Number    
320     170-9844     7Y-5118     199-7424     087-5394     087-5496     Cylinder    
199-7425 7Y-5145     7I-7291     Bucket Cylinder    
7Y-5100 Bucket Cylinder    
170-9847 (1) 096-2663     199-7427 (2)     087-5387     087-6638     Stick Cylinder Gp    
087-5422 Stick Cylinder Gp    
320B     170-9844     123-1943     199-7424     176-4912     118-4128     Boom Cylinder Gp    
118-4134 Bucket Cylinder    
170-9847 (1) 123-1983     199-7427 (2)     176-4913     118-4156     Stick Cylinder Gp    
118-4150 Stick Cylinder Gp    
118-4024 Service Repair     Stick or Boom    
322     128-9265     7Y-4671     199-7416     176-4933     7Y-5150     Cylinder    
170-9845 096-1585     199-7426     7I-1360     7I-1345     Boom Cylinder Gp    
170-9844 7Y-5118     199-7425     7Y-5145     7I-7291     Bucket Cylinder    
170-9847 (1) 096-2663     199-7427 (2)     087-5387     7I-7341     Stick Cylinder Gp    
322B     128-9265     123-1942     199-7416     168-0758     118-3921     Bucket Cylinder    
170-9845 123-2048     199-7426     176-4914     118-4166     Boom Cylinder Gp    
118-4008 Bucket Cylinder    
170-9847 (1) 123-1983     199-7427 (2)     176-4913     118-4176     Stick Cylinder Gp    
118-4024 Service Repair     Stick or Boom    
325     128-9265     7Y-4671     199-7416     176-4933     7Y-5150     Cylinder    
170-9844 7Y-5118     199-7424     176-4934     087-5633     Bucket Cylinder    
199-7425 7Y-5145     7Y-5100     Bucket Cylinder    
325B     128-9265     123-1942     199-7416     168-0758     118-3921     Bucket Cylinder    
170-9845 123-2048     199-7426     176-4914     123-2044     Bucket Cylinder    
170-9847 (1) 123-1983     199-7427 (2)     176-4913     114-0636     Boom Cylinder Gp    
118-4024 Service Repair     Stick or Boom    
330     128-9265     7Y-4671     199-7416     176-4933     7Y-4906     Cylinder    
7Y-5150 Cylinder    
128-9266 7Y-4943     199-7417     191-3171     7Y-4926     Cylinder    
204-2721 176-4932     087-5531     Cylinder    
170-9844 7Y-5118     199-7425     7Y-5145     7Y-5100     Bucket Cylinder    
330B     128-9265     123-1942     199-7416     168-0758     116-3578     Boom Cylinder Gp    
118-3921 Bucket Cylinder    
128-9266 123-2031     199-7417     191-3171     191-3118     Stick Cylinder Gp    
204-2721 168-0760     118-3935     Bucket Cylinder    
345B     128-9266     123-2031     204-2721     168-0760     129-7829     Boom Cylinder Gp    
118-3935 Bucket Cylinder    
204-2720 168-0759     129-7835     Bucket Cylinder    
170-9850 126-2108     200-3498     165-9416     129-7832     Stick Cylinder Gp    
345B Series II     128-9266     123-2031     204-2721     168-0760     173-3541     Bucket Cylinder    
204-2720 168-0759     173-3545     Bucket Cylinder    
350     128-9266     7Y-4943     204-2720     156-0655     4I-1515     Boom Cylinder Gp    
204-2721 156-0656     156-0737     Bucket Cylinder    
170-9850 096-5169     200-3499     156-0625     156-0674     Stick Cylinder Gp    
156-0730 Bucket Cylinder    
365B L     170-9849     155-9101     204-2723     170-9828     155-9177     Boom Cylinder Gp    
170-9851 147-5769     204-2728     170-9829     179-9794     Stick Cylinder Gp    
143-8007 Bucket Cylinder    
170-9850 126-2108     204-2724     170-9830     143-8004     Bucket Cylinder    
375
5080    
170-9851     147-5769     200-3495     156-0626     114-0596     Boom Cylinder Gp    
6E-0018 Boom Cylinder Gp    
156-0694 Bucket Cylinder    
8C-9189 5I-8892 Service Repair     H Family    
170-9853 194-8368     200-3496     156-0627     156-0679     Stick Cylinder Gp    
156-0697 Bucket Cylinder    
8C-9193 200-3497     5I-8893     Service Repair     J Family    
( 1 ) Serviced By 167-2215 Buffer Seal As
( 2 ) Serviced By 214-6321 Seal Kit

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