HOSE AS-GUARD 5083558 - Caterpillar

Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.To prevent possible injury, perform the procedure that follows before testing and adjusting the power train.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Before any tests are performed, prepare the machine. Refer to Testing and Adjusting, "Machine Preparation". Before any tests are performed, visually inspect the complete hydraulic system for oil leaks and damaged parts. Refer to Testing and Adjusting, "Visual Inspection".Note: The oil in the hydraulic system must be at an operating temperature of 50° 10°C (122° 18°F). In order to increase the oil temperature, start the engine and operate all the cylinders for at least five cycles. Also, drive the machine forward and drive the machine rearward for a few minutes.This test is performed in order to ensure that the gear motor (fan) is running at the proper speed.
Table 1
Required Tools
Tool Part Number Part Description
A 275-5120 Communication Adapter Gp
B 9U-7400 Multitach Tool Gp
C 1U-6605 Reflective Tape
Table 2
Model Fan Speed (Min) Fan Speed (Max)
246C 1100 50 RPM 2490 50 RPM
256C/ 262C/ 262C2/ 272C 1100 50 RPM 2690 50 RPM
Release the hydraulic system pressure. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release" for the correct procedure.
Illustration 1 g01364212
Install Tooling (A) to the diagnostic connector (1) of the machine in order to measure engine rpm.
Connect Tooling (A) and the Caterpillar Electronic Technician (ET).
Open the engine access door.
Illustration 2 g01364215
Install Tooling (B) in order to measure fan rpm. Use the reflective tape (C) that is on the fan blade.
The oil in the hydraulic system must be at an operating temperature of 50° 10°C (122° 18°F). In order to increase the oil temperature, start the engine and operate all the cylinders for at least five cycles. Also, drive the machine forward and drive the machine rearward for a few minutes.
Set the throttle to the high idle position.
Illustration 3 g01372106
(D) "Diagnostic" drop-down menu
(E) "Diagnostic Tests"
(F) "Override Parameters"
Use the ET software in order to change the maximum fan current override value to 100%. Refer to Illustration 3 for the "Diagnostic" screen display. Click "Override Paramaters".
Record the minimum fan speed value.
Use the ET software in order to change the maximum fan current override value to 0%.
Record the maximum fan speed value.
If the fan speed is not within the specification, use the Electronic Technician in order to perform the fan speed calibration procedure. Refer to Table 2 for the specification.