2009/09/30 Water Pump Operation {1361, 7555} Caterpillar

Water Pump Operation {1361, 7555}

2009/09/30 [SEPD1012]

2009/09/30 Changes to the Gasket for the Engine Oil Filter Base on Some C11 and C13 Engines {1306, 7555}

2009/09/30 A New Steering Filter Cover is Now Used {4304, 5068}

COOLING SYSTEM

PUMP GP-WATER

2009/09/30 Water Pump Operation {1361, 7555}

Asphalt Paver:
AP555E (S/N: A5D1-UP)
AP600D (S/N: TFM1-UP)
AP600D (S/N: TFZ1-UP)
AP655D (S/N: GNN1-UP; MAN1-UP; MAT1-UP; GNZ1-UP)
Backhoe Loader:
420E (S/N: PRA1-UP; PHC1-UP)
430E (S/N: SCD1-UP; RLN1-UP)
450E (S/N: EBL1-UP)
Soil Compactor:
CP56 (S/N: C5P1-UP; FCP1-UP)
CP64 (S/N: P7F1-UP; C6P1-UP)
CS44 (S/N: M4C1-UP; M4S1-UP)
CS74 (S/N: C8F1-UP; C8S1-UP)
CS76 (S/N: JCS1-UP; CYX1-UP)
Excavator:
M313D (S/N: W3H1-UP)
M315D (S/N: W5M1-UP)
M316D (S/N: W6A1-UP)
M318D (S/N: W8P1-UP; W8R1-UP)
M322D (S/N: W2S1-UP; W2T1-UP)
Integrated Toolcarrier:
IT38H (S/N: JNJ1-UP)
Load Haul Dump:
R1300GSeries II (S/N: RSL1-UP)
Motor Grader:
120M (S/N: B9C1-UP; B9N1-UP; B9W1-UP; D9W1-UP)
12M (S/N: B9F1-UP; B9R1-UP)
Paving Compactor:
CB54 (S/N: JLM1-UP)
CB64 (S/N: DJM1-UP)
CP54 (S/N: C5Y1-UP)
CP74 (S/N: P8F1-UP)
CP76 (S/N: C7L1-UP; JCP1-UP)
CS54 (S/N: C5R1-UP; C5W1-UP)
CS56 (S/N: C5S1-UP; FCS1-UP)
CS64 (S/N: C7F1-UP; C6S1-UP)
Pipelayer:
PL61 (S/N: WGS1-UP)
Track-Type Loader:
953D (S/N: LBP1-UP)
963D (S/N: LCS1-UP)
Track-Type Tractor:
D3K (S/N: JTD1-UP; FFF1-UP; LLL1-UP)
D4K (S/N: MMM1-UP; RRR1-UP)
D5K (S/N: JLF1-UP; WWW1-UP; YYY1-UP)
D6K (S/N: DHA1-UP; HMG1-UP; FBH1-UP)
D6N (S/N: DJA1-UP; JAH1-UP; LJR1-UP; GHS1-UP; MLW1-UP; DJY1-UP)
Wheel Loader:
924H (S/N: HXC1-UP; JTM1-UP; KLN1-UP)
924HZ (S/N: WLB1-UP; PED1-UP; BEF1-UP)
928H (S/N: RSB1-UP)
928HZ (S/N: BYD1-UP; CXK1-UP)
930H (S/N: DHC1-UP; FTD1-UP)
938H (S/N: MCC1-UP; MJC1-UP; JKM1-UP; LKM1-UP)
Wheel Tractor-Scraper:
613G (S/N: ESB1-UP; DBE1-UP)
Service Magazine SEPD1011, 28 September 2009, "Water Pump Operation". Disregard this article. See the article that follows.

The 322-9662 Water Pump Gp and 307-9843 Water Pump Gp contains a rotary seal that uses the engine coolant as a lubricating medium. This will ensure that an adequate sealing film is created and maintained in order to reduce heat generation.

During normal operation, the seal on the shaft in the water pump will allow a small amount of coolant and vapor to pass over the seal into a chamber area. The chamber area allows coolant that is expelled over the seal to evaporate. The vapor will exit out of the weep hole. In certain environmental conditions and operating conditions, not all of the liquid will be evaporated. If the coolant is unable to evaporate from the chamber the coolant may be expelled from the weep hole. A small amount of coolant from the weep hole is not a failure of the seal. In normal pump operation, a small loss of coolant from the weep hole will occur. A small loss of coolant will be one drop of coolant within a ten second period.

The seal faces can become damaged by debris. The seal will repair any damage within thirty hours of the event in most cases. Coolant level should be regularly checked during this period.

If there is severe damage to the seal on the shaft of the water pump a significant amount of coolant will be lost through the weep hole.

If a coolant leak is discovered near the water pump, it is important to determine if the coolant leak is a new event. Remove the stain from the water pump. Remove the stain from the front of the engine. Check the coolant level. Check the area regularly for signs of a continued leak.

Nonfixable damage to the seal can occur when there is insufficient coolant around the seal. This increases the rate of weep. The leak rate will be more than one drop of coolant within a time of ten seconds. If the leak rate will be more than one drop of coolant within a time of ten seconds or the leakage does not stop after thirty hours, a service engineer should make a more detailed investigation.

The following situations can cause cooling fluid starvation problems around the seal: