345D, 349D and 349D2 Excavators Hydraulic System Caterpillar

Swing Motor - Test - Measurement of Case Drain Oil

Usage:

Specification

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Table 1
"Swing Motor - Test (Measurement of Case Drain Oil)" for 334-9975 Swing Motor Gp
Machine Settings	Swing Relief Pressure		Engine Speed
Machine Settings	31400 ± 1000 kPa (4555 ± 145 psi)		Engine speed dial "10" AEC Switch OFF
Item	Specification⁽¹⁾	Actual
New Swing Motor	30 L/min (7.9 US gpm)	1.
		2.
		3.
Rebuilt Swing Motor	35 L/min (9.2 US gpm)	1.
		2.
		3.

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⁽¹⁾	Maximum acceptable flow

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Table 2
"Swing Motor - Test (Measurement of Case Drain Oil)" for 486-5236 Swing Motor Gp
Machine Settings	Swing Relief Pressure		Engine Speed
Machine Settings	29000 ± 1000 kPa (4206 ± 145 psi)		Engine speed dial "10" AEC Switch OFF
Item	Specification⁽¹⁾	Actual
New Swing Motor	30 L/min (7.9 US gpm)	1.
		2.
		3.
Rebuilt Swing Motor	35 L/min (9.2 US gpm)	1.
		2.
		3.

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⁽¹⁾	Maximum acceptable flow

Introduction

Use the following procedure to measure the case drain of the swing motor.

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NOTICE

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.

Note: Certain machines will default to "Economy Mode" at machine startup. Change to "High Hydraulic Power Mode" before performing the test procedure.

Required Tools

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Table 3
Required Tools
Part Number	Description	Qty
6V-9832	Cap	1
	Wrench 35 mm (1.375 inch)	1
	Container for Measuring	1

Machine Preparation

Stop the engine.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release".
Attach 311-1362 Vacuum Cap onto the hydraulic tank. Attach an air supply hose onto the assembly. Apply 276 to 414 kPa (40 to 60 psi). This procedure will pull a vacuum on the hydraulic system.
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Illustration 1 g01132475

Swing motor compartment
(1) Case drain hose
(2) Tee
Disconnect the case drain hose (1) from tee (2). Place the open end of the case drain hose (1) into the container for measuring.
Install 6V-9746 O-Ring Seal and 6V-9832 Cap on tee (2) of the swivel.
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Illustration 2 g01132476

Pilot manifold
(3) Connector
(4) Solenoid valve for swing parking brake
Disconnect connector (3) from solenoid valve (4) for the swing parking brake.
Remove 311-1362 Vacuum Cap and install the filler plug for the hydraulic tank.

Test Procedure

Start the engine.
Place the engine speed dial at position "10" and AEC switch OFF.
Reference: Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for engine rpm settings.
Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
Slowly move the swing joystick and make sure that the swing parking brake is activated.
Move the swing joystick fully for one minute. Measure the case drain oil.
Stop the engine.
Connect connector (3) to the solenoid valve for swing parking brake (4).
Repeat this test procedure three times to obtain three measurements. For each test procedure, swing the upper structure to a different position.
Compare the measurements of the flow of case drain oil to the specifications. Refer to Table 1 or Table 2.