LATCH (L.H.) 9D5193 - Caterpillar

Off-Highway Truck/Tractor769C (S/N: 01X75400-UP)769D (S/N: 5SS76001-UP)772 (S/N: RLB865-UP)773B (S/N: 63W76006-UP)773D (S/N: NBJ76001-UP; 7ER76001-UP; 7CS75003-UP)773E (S/N: BDA78001-UP; PRB1-UP; KEG235-UP; ASK967-UP; DJS1-UP)777C (S/N: 4XJ78005-UP)777D (S/N: AGC75005-UP; FKR2114-UP; 3PR77001-UP)777E (S/N: KDP1-UP)OEM POWERTRAIN (S/N: DTE561-UP)Quarry Truck771C (S/N: 3BJ76001-UP)771D (S/N: BCA76002-UP; 6YS76004-UP)775D (S/N: 8AS75004-UP)775E (S/N: BEC75001-UP)A 550-2449 Cab Blower (Kit) is available for certain Off-Highway Trucks. Installation of the cab blower kit will extend the service life of the climate control system.The current 174-1489 Electric Motor Gp is being replaced by the 453-2441 Blower As. Refer to the parts table and following procedure for rework information.The following changes are now available for the products within the listed serial numbers.
Table 1
Required Parts(1)
Item Qty New Part Number Description Former Part Number(2)
1 1 153-6932 Gasket -
2 1 453-2441 Blower As 174-1489
3 1 550-2450 Plate As -
4 1 550-2451 Plate As -
5 1 7K-1181 Cable Strap -
6 4 8T-0337 Screw -
(1) All required parts are part of the 550-2449 Cab Blower (Kit)
(2) The former part number listed is for reference only and may differ.Note: The 550-2449 Cab Blower (Kit) is not serviceable. All required parts must be ordered individually.
Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.
Rework Procedure
Illustration 1 g06266772
Front view of the cab
Remove front cab panel to gain access to the blower assembly. Retain the panel and fasteners to reinstall later.
Illustration 2 g06270168
View of HVAC enclosure
(A) Old blower behind plate
Illustration 3 g06270171
View of outside of HVAC enclosure
(B) Main harness receptacles
(C) Existing grommet
(D) Wire clips
(E) Fasteners
(F) Support handles
(G) Outer plate
Disconnect three wiring receptacles (B) from the main harness assembly.Remove existing grommet (C), along with two wire clips (D) and retain for later use.Feed the wiring harness assembly through the hole in the cover plate to the Blower compartment.Remove all the fasteners (E) and release three support handles (F) connecting the HVAC unit to the frame.Remove outer plate (G).Note: The blower assembly and resistor components are attached to the outer plate and will come out with plate (G) when plate (G) is removed.
Illustration 4 g06270409
View of blower unit removed from HVAC housing
Disconnect the harness from blower, remove any wire ties securing the harness and resistor harnesses to the plate. Remove the harness and retain for later.Note: Note which wires go on which tab on the resistor before removing this portion of the harness connection.
Illustration 5 g06270443
View of the back of the blower box
(D1) 3.9 mm (0.15354 inch)
(D2) 0.08 mm (0.003 inch)
(D3) 217.5 mm (8.6 inch)
(D4) 111.0 mm (4.4 inch)
(D5) 10.8 mm (0.4 inch)
(D6) 13 mm (0.51 inch)