Doosan DL350-5 Loader Engine Hydraulic Control Unit Disassembly

this article introduces the disassembly of Doosan DL350-5 loader Engine HYDRAULIC CONTROL UNIT

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NOTE: Check all components for damage and replaceif 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 onslides 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 ofpressure reducing valve.
(S) Adjusting screws -5870204036






5
Fasten housing cover using socket head screws.
NOTE : Torque limit 0.56 kg-m(4 ft Ib).
(S) Box spanner (Torx TX-27)-5873042002




6.
Install pressure regulators and secure using fixing plates asasc.
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 Ib).
(S) Box spanner (Torx TX-27)-5873042002




7.
Preassemble opposite side.



B.I nstall components according to Figure 96.

 


 

C. Preload compression springs of the follow on slidesand 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.

 


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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

I.
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 s .
NOTE: Torque limit 0.56 kg-m (4 ft Ib).
(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 I.
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).




B. Mount intermediate plate, with screens with screens facingupward.





C. Mount gasket II.






D. Mount duct plate and fasten it uniformly using socket head screws.
NOTE: Torque limit 0.97 kg-m (7 ft Ib).
(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 Ib).
NOTE: The installation of hydraulic control unit is described in following section,"Mount Duct Plate and Hydraulic Control Unit"on page-142.

 




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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