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OPERATOR AR 3904346 - Caterpillar

3904346 OPERATOR AR Caterpillar parts 308E CR OPERATOR
Alternative (cross code) number:
Caterpillar 3904346 OPERATOR AR

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Compatible equipment models: 3904346:

MINI HYD EXCAVATOR  308E CR   Caterpillar
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Personal injury or death can result from sudden machine movement.Sudden movement of the machine can cause injury to persons on or near the machine.To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.
Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the attachments have been lowered, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines.Dispose of all fluids according to local regulations and mandates.
Table 1
Required Tools
Tool Part
Number Description Qty
A 8T-0860 Pressure Gauges
0 to 40000 kPa (0 to 5800 psi) 1
6V-4144 Quick Connect Couplers 1
B 177-7860 Hose As 1
6V-4142 Fittings 2
6V-4143 Quick Connect Couplers 2
Table 2
Optional Tools(1)
Tool Part Number Description Qty
C(2) 198-4234 Pressure Gauge Tool Gp 1
D(2) 198-4236 Adapter Cable As 2
E(2) 198-4239 Pressure Sensor Gp 2
(1) The optional tools can be used to replace the analog pressure gauges in the required tool list.
(2) Tool (C), Tool (D), and one Tool (E) are part of the 198-4240 Digital Pressure Indicator.Note: The illustrations in the following procedure show the Water Delivery System installed on a 777F Off-Highway Truck.
Drive the machine to a smooth, horizontal surface.
Place the transmission gear selector in the PARK position.
Apply the brakes. Place blocks in front of the rear wheels and behind the rear wheels. Do not place blocks around the front wheels.
Operate the engine at high idle.
Turn the steering wheel to the right until the steering cylinder stop is reached. Continue turning the steering wheel against the stop. Hold the steering wheel in this position for 3 seconds, and then, release the steering wheel. Continue this step until the oil in the steering system reaches a temperature between 38 °C (100 °F) and 93 °C (200 °F)
Operate the engine at low idle for a few minutes. Shut down the engine.
Assemble Tool (A) and Tool (B). Connect Tool (A) to Tool (B).
Illustration 1 g02763193
Locate steering check and relief valve (2) on the machine frame behind the right front suspension cylinder.
Install Tool (B) on pressure tap (1) for the steering system.
Start the engine. Operate the engine at low idle.
Place the transmission gear selector in the NEUTRAL position. Note: When the transmission gear selector is in the

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