DOOSAN DL350 Wheel Loader Hydraulic Control Unit Reassembly Guide



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

 

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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.     Figure90,showsthe following components:

 

  1. Installcomponents 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.

 

 

 

  1. Install two adjusting screws.
  2. Assemblegasket  (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

 

  1. Fastenhousing cover using socket head screws.

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

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

 

  1. Installpressure 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

 

  1. Preassemble opposite side.

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B.I    nstall  components according to Figure 96.

  1.    Preloadcompressionsprings of the follow on slides and locatespool provisionally using cylindrical pins O 5mm(0.1969  in)(assembly  aid).See  arrows.
  2.     Installtwoadjusting 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.

  1.     Fastenhousingcover using socket head screws.

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

  1.     Removecylindrical 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

 

  1.       Introduce   cable    harness andconnect   pressure regulators (6x).

NOTE:      Pay  attention  to  installation  position  of  cable

harness,see also markings (Figure 79).

 

  1.      Introducefemale   connectoragainst  shoulder,with groove facing guide nose of cover.
  2. Install   gaskets(Figure100)and fasten  cover using socket head screws.

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

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

 

  1.      Securefemaleconnector using retaining clamp,see Figure 101.
  2. Installopposite cover.

 

  1.     Install two adjustingscrewsand mount gasket l.

NOTE:      Pay  attention  to  different  gaskets,see  Figure

102 and Figure 105.

(S)Adjusting   screws   -5870204063

 

  1. Intermediateplate-version with screens:
  2.     Insert    screens(6x)flash    -mountedintobore   of intermediate plate,see Figure 103.

NOTE:       Pay  attention  to  installation  position-screens

are facing upward (facing duct plate).

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  1.     Mountintermediateplate,with screens with screens facing upward.

 

 

 


  1.     Mount gasketIl.

 

 

 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

 

  1.     Equip screwplugs (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.