320 GC, 320 and 323 Excavator Machine Systems Caterpillar

Travel Motor - Test - Measurement of Case Drain Oil

Usage:

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Table 1
"Travel Motor - Test (Measurement of Case Drain Oil)"
Machine Settings	Crossover Relief Pressure		Engine Speed
Machine Settings	37500 ± 1500 kPa (5439 ± 218 psi)		Engine speed dial "7" AEC switch OFF
Item	Specification⁽¹⁾	Left Travel	Right Travel
New Travel Motor	20 L/min (5.3 US gpm)	1.	1.
		2.	2.
		3.	3.
Rebuilt Travel Motor	23 L/min (6.1 US gpm)	1.	1.
		2.	2.
		3.	3.

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⁽¹⁾	Maximum acceptable flow

Use the following procedure to measure the case drain of the travel motors.

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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.

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Table 2
Tool	Item	Qty	Part Number	Description
D	D1	1	6V-7788	Flow Meter 5 to 60 L/min (2 to 15 US gpm)
	D2	1	8C-6874	Reducer
	D3	1	6V-9746	O-Ring Seal
	D4	1	124-1901	Permanent Coupling
	D5	3 ft	122-6870	Bulk Hydraulic Hose
	D6	1	124-2147	Permanent Coupling
	D7	1	6V-8942	O-Ring Reducer
	D8	1	6V-8556	Nut
	D9	1	6V-8398	O-Ring Seal
F		1	311-1362	Vacuum Cap
G		1	418-3611	Track Block

Position the machine on level ground.
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Illustration 3 g06196223

Sprocket (left travel)
(G) Track Block
(1) Sprocket
Place track block (G) in sprocket (1) to block forward left travel. Refer to Illustration 3.
Stop the engine.
Release the pressure in the hydraulic system. Refer to Operation and Maintenance Manual, "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 4 g06375729

Flow Meter Tool Layout
Tooling (D)
( 2) Case drain hose
(3) Connector
(4) Travel motor
Install the following tools in accordance with the flow meter tool layout. Refer to Illustration 4.
Disconnect case drain hose (2) from connector (3).
Connect the flow meter assembly (D) between connector (3) and case drain hose (2).
Note: Correct orientation of the flow meter is necessary. The oil flows from travel motor (4) to case drain hose (2).
Remove 311-1362 Vacuum Cap.

Start the engine.
Place the hydraulic activation control lever in the UNLOCKED position.
Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
Place the machine controls at the following settings: engine speed dial "7" and AEC switch OFF
Move the left travel lever to full FORWARD position and check the flow of oil through the flow meter. Refer to Table 1.
Remove track block (G) from sprocket (1).
Move the left travel lever to reposition the travel motor.
Place track block (G) in sprocket (1) to block forward left travel.
Repeat Steps 5 through 8 to obtain three measurements of case drain oil.