Doosan DX300LC Excavator Flow Meter and Kit Installation/Test

This instruction show you guide on how to perform flow meter and kit installation and test for Doosan DX300LC excavator.

Doosan DMS-5 Diagnostic Software

Procedures:
Checking regulator and pump output, to assess the output balance between the front and rear pumps and to verify
operating adjustment of each regulator, will require installation of a flow meter.
The After Sales Service department of the nearest local DOOSAN dealer can assist you with these tests or, if you prefer
carrying out your own testing, they should be able to help in putting together a hose and fitting kit (or the required dimensions
and specifications for hoses and fittings) to allow you to install a flow meter downstream from the main pump assembly.

Installation and Testing Procedure
• Shut down engine and operate controls to release hydraulic pressure from the accumulator.Doosan EPC 2017
• Vent the reservoir to release all pressure from the hydraulic system.
• Remove guard panels from around the main pump assembly.
• Disconnect the main pump discharge output line.

Install the input flange of the flow meter on the pump end of the output line.
• Cap off the unused (input) end of the pump discharge line with a blocking flange.
• Connect a premeasured length of hydraulic hose,between the output end of the flow meter assembly and the top of the reservoir.
Use appropriate fittings
and adapter flanges to guarantee a pressure tight seal.
NOTE: Be sure to maintain even tightening torque on all flange fittings. Use Loctite brand "PST 545" (or an alternate manufacturer's hydraulic system joint seal) if required, to give an airtight seal.
• An assistant – who must remain at the operator's control station at all times – should restart the engine and run it long enough (at minimum rpm) to de-aerate the system and warm up the engine and hydraulic system to operating temperature.
Record the values of all test results in three columns, comparing
1) pump pressure (from the instrument panel display) with 2) measured flow, in gallons or liters per minute, from the installed flow meter. The third column of test results should provide a record of engine rpm measured during each of the following
tests – with the engine speed control dial set at maximum, the power mode selector at Power Mode and the work mode selector at digging mode:
• Unloaded maximum engine speed baseline test (all controls in neutral).
• Front pump test – operate "travel right" lever. Record values at all specified pressures.
• Rear pump test – operate "travel left" lever. Record values at all specified pressures.

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Record the values for each of the three tests (neutral, travel right and travel left) at the following pump pressure levels, with travel speed control set at "high speed."