DOOSAN DL350 Wheel Loader Hydraulic Control Unit Reassembly Guide

This article introduces the Reassembly of the DOOSAN DL350 wheel loader hydraulic control device

 

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

Reassembly

NOTE:      Check all components for damage and replace

if   necessary.Before    installation,check    free  travel of all moving parts in housing.Spools can be    exchanged    individually.Oil    components before  reassembly  according  to  ZF  list  of lubricants TE-ML 03.

Insert  diaphragms  with  concave  side  facing upward until contact is obtained.

NOTE:     Installation position,see arrows.

 


 



1.     Figure 90,shows the following components:

 


2.  Install components according to Figure 90.

NOTE:      Preload  compression  spring  of  the  follow  on

slides   and   locate   spool  provisionally  using cylindrical pins 05.0 mm (0.1969 in)(assembly aid),See Figure 91.

 

 


 


3.  Install two adjusting screws.

4.  Assemble gasket  (1,Figure 92)and housing cover (Figure 92).Position   housing   cover   uniformly,using   adjusting screws,until  contact  is  obtained  and  remove  cylindrical pins (assembly aid)again(Figure 93).

NOTE:      Pay attention to different housing covers.

NOTE:      Install   recess   015.0  mm(0.5906  in)(2,Figure

92),facing spring of pressure reducing valve.

(S)Adjusting   screws   -5870204036

 

 

 



 

5.  Fasten housing cover using socket head screws.

NOTE :   Torque limit 0.56 kg-m(4 ft lb).

(S)Box  spanner  (Torx  TX-27)-5873042002

 

 

 


 

6.  Install pressure regulators and secure using fixing plates and socket head screws.

NOTE:       Install fixing plate,with  claw facing downward.

Pay attention  to  radial  installation  position  of pressure regulators,see Figure 95.

NOTE:      Torque limit 0.56 kg-m (4 ft lb).

(S)Box  spanner  (Torx  TX-27)-5873042002

 


 

7.  Preassemble opposite side.


 


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B.I    nstall  components according to Figure 96.

C.    Preload compression springs of the follow on slides and locatespool provisionally using cylindrical pins O 5mm(0.1969  in)(assembly  aid).See  arrows.

D.     Install two adjusting screws.

E.Assemble   gasket(1,Figure   97)and    housing    cover,  and  position them  uniformly against shoulder,using adjusting screws.

NOTE:     Pay attention to different housing covers,install

the   recess   019mm(0.7480   in)(2,Figure   97), facing the main pressure valve.

F.     Fasten housing cover using socket head screws.

NOTE:      Torque limit 0.56 kg-m (4 ft lb).

G.     Remove cylindrical pins (assembly aid)again. (S)Adjusting  screws  -5870204036

(S)Box  spanner  (Torx  TX-27)-5873042002

H.Install    pressure    regulators  and  secure  using  fixing plates and socket head screws.

NOTE:      Install fixing plates,with claw facing downward.

Pay attention  to  radial  installation  position  of pressure regulators,see Figure 98.

NOTE:      Torque limit 0.56 kg-m (4 ft lb).

(S)Box  spanner  (Torx  TX-27)-5873042002

 

 

 




l.       Introduce   cable    harness   and   connect   pressure regulators (6x).

NOTE:      Pay  attention  to  installation  position  of  cable

harness,see also markings (Figure 79).

 


 

 

J.      Introduce  female   connector  against  shoulder,with groove facing guide nose of cover.

K.     Install   gaskets(Figure    100)and fasten  cover using socket head screws.

NOTE:      Torque limit 0.56 kg·m (4 ft lb).

(S)Box  spanner  (Torx  TX-27)-5873042002



 

L.      Secure female connector using retaining clamp,see Figure 101.

M.    Install opposite cover.

 


N.     Install two adjusting screws and mount gasket l.

NOTE:      Pay  attention  to  different  gaskets,see  Figure

102 and Figure 105.

(S)Adjusting   screws   -5870204063

 


8.  Intermediate plate-version with screens:

A.     Insert    screens(6x)flash    -mounted   into   bore   of intermediate plate,see Figure 103.

NOTE:       Pay  attention  to  installation  position-screens

are facing upward (facing duct plate).

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B.     Mount intermediate plate,with screens with screens facing upward.

 

 


  

C.     Mount gasket Il.

 


 D.Mount  duct  plate  and  fasten it uniformly using socket head screws.

NOTE:      Torque limit 0.97 kg-m (7 ft lb).

(S)Box spanner (Torx TX-27)-5873042002

 

 


 E.     Equip screw plugs (8x)with new O-rings and install them.

NOTE:      Torque limit 0.61 kg-m (4 ft lb).

NOTE:     The  installation  of  hydraulic  control  unit  is

described  in  following  section,“Mount  Duct Plate and Hydraulic Control Unit"on page -142.

 

 

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