How to replace the DL300-3/DL350-3 wheel loader valve stem seal and valve seat

This article explains how to replace the DL300-3/DL350-3 wheel loader valve stem seal and valve seat

2023.07 Doosan DMS-5 Data Monitoring System Diagnostic Software

Replacing a Valve Stem Seal

1. Removevalve  according  to  the  work  description  for Removing valves.
2.   Remove valve stem sealwitha pair of pliers.
3.  Install thevalve.

4，Carefully tap a new valve stem seal into place using tool 99 323 and a hammer.

Replacing the Valve Seats

1.          Removevalveseat inserts with an expanding sleeve from the kit with puller 587270 (1,Figure 22).

NOTE:      Insert,    for    example,    an    aluminum    sheet

between the cylinder head and counterhold to protect against damage.

WARNING

AVOID DEATH OR SERIOUS INJURY

Wear protective goggles for eye protection from flying metal parts.

 Doosan Diagnostic Tool DDT G2 SCAN( ECU ,DCU)Software 2016

Pressin new valve seat inserts.Use drift 99384(2,Figure

22)and shank 99385.Cool the drift and valve seat insert

to about -80°℃ with dry ice or liquid air.Pressing must be

done rapidly.

Doosan Diagnostic Tool UVIM Support Doosan Excavators High Quality