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.
- Figure90,showsthe following components:
- 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.
- Install two adjusting screws.
- 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
- Fastenhousing cover using socket head screws.
NOTE : Torque limit 0.56 kg-m(4 ft lb).
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- 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
- Preassemble opposite side.
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B.I nstall components according to Figure 96.
- Preloadcompressionsprings of the follow on slides and locatespool provisionally using cylindrical pins O 5mm(0.1969 in)(assembly aid).See arrows.
- 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.
- Fastenhousingcover using socket head screws.
NOTE: Torque limit 0.56 kg-m (4 ft lb).
- Removecylindrical pins(assembly aid)again. (S)Adjusting screws -5870204036
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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).
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- Introduce cable harness andconnect pressure regulators (6x).
NOTE: Pay attention to installation position of cable
harness,see also markings (Figure 79).
- Introducefemale connectoragainst shoulder,with groove facing guide nose of cover.
- Install gaskets(Figure100)and fasten cover using socket head screws.
NOTE: Torque limit 0.56 kg·m (4 ft lb).
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- Securefemaleconnector using retaining clamp,see Figure 101.
- Installopposite cover.
- Install two adjustingscrewsand mount gasket l.
NOTE: Pay attention to different gaskets,see Figure
102 and Figure 105.
(S)Adjusting screws -5870204063
- Intermediateplate-version with screens:
- 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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- Mountintermediateplate,with screens with screens facing upward.
- 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
- 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.