- Off-Highway Truck/Tractor:
- 777G (S/N: T5A1-UP; TNM1-UP; RDR1-UP; T4Y1-UP; GT71-UP)
- Quarry Truck:
- 773G (S/N: MWH1-UP; JWS1-UP; T5S1-UP; T5T1-UP)
- 775G (S/N: T5F1-UP; RFM1-UP; MJS1-UP; T5W1-UP)
The new special instructions contains information that is needed to install the cold-weather cover group onto certain Off-Highway Trucks. The cold-weather group will improve the machines performance while operating in cold climate.
For a complete list of material and the correct procedure that is needed in order to install the cold-weather cover group, refer to Special Instruction, REHS9320, "Procedure to Install the Cold Weather Cover Group onto Certain Tier IV 773G, 775G and 777G Off-Highway Trucks" or Special Instruction, REHS9329, "Procedure to Install the Cold Weather Cover Group onto Certain Tier II 773G, 775G and 777G Off-Highway Trucks". The special instructions can be found on the Caterpillar service information system (SIS) and through the normal literature distribution system at your local Cat dealer.
Operating Conditions
| Operating Conditions for the use of the 449-0978 Cover Gp and the 449-8545 Cover Gp | ||
| Ambient Temperature | Operating Machine | Machine Extended Idle |
−40° C (−40° F) and Below |
Cover closed | Cover closed |
−40° C (−40° F) to 0° C (32° F) |
Cover half open | Cover closed |
0° C (32° F) to 15° C (59° F) |
Cover fully open | Cover closed |
15° C (59° F) and Above |
Remove cover | Remove cover |
- When the machine is at extended idling over 5 minutes or machine is operating in a temperature of −40° C (−40° F) and below, close the cover group.
 | |
| Illustration 1 | g03604000 |
View of the cover group closed 777G | |
 | |
| Illustration 2 | g03620577 |
View of the cover group closed 773G/775G | |
- When operating the machine in temperatures between −40° C (−40° F) to 0° C (32° F) open half, top or bottom, of the cover group,
 | |
| Illustration 3 | g03604096 |
View of the cover group half-way open 777G | |
 | |
| Illustration 4 | g03620604 |
View of the cover group half-way open 773G/775G | |
- When operating the machine in temperatures between 0° C (32° F) to 15° C (59° F) fully open (top and bottom) of the cover group.
 | |
| Illustration 5 | g03604176 |
View of the cover group fully opened 777G | |
 | |
| Illustration 6 | g03620618 |
View of the cover group fully opened 773G/775G | |
- When operating the machine in temperature 15° C (59° F) and above, remove the cover group.
 | |
| Illustration 7 | g03604198 |
View of the cover group removed 777G | |
 | |
| Illustration 8 | g03620641 |
View of the cover group removed 773G/775G | |