The document provides instructions for disassembling and assembling a priority valve and steering unit. It includes diagrams showing the individual parts of each component.
For the priority valve:
1) The disassembly instructions describe removing the piping and then loosening screws to remove the plugs and spool.
2) Cleaning, inspection and lubrication steps are outlined before assembly.
3) Reassembly involves placing parts back in reverse order and tightening screws to specified torques.
For the steering unit:
1) Disassembly requires removing screws, pins and O-rings to separate the housing, gearwheel, plates and spool/sleeve.
2) Assembly shows replacing parts
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Comprehensive program for Agricultural Finance, the Automotive Sector, and Empowerment . We will define the full scope and provide a detailed two-week plan for identifying strategic partners in each area within Limpopo, including target areas.:
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𝘼𝙣𝙩𝙞𝙦𝙪𝙚 𝙋𝙡𝙖𝙨𝙩𝙞𝙘 𝙏𝙧𝙖𝙙𝙚𝙧𝙨 𝙞𝙨 𝙫𝙚𝙧𝙮 𝙛𝙖𝙢𝙤𝙪𝙨 𝙛𝙤𝙧 𝙢𝙖𝙣𝙪𝙛𝙖𝙘𝙩𝙪𝙧𝙞𝙣𝙜 𝙩𝙝𝙚𝙞𝙧 𝙥𝙧𝙤𝙙𝙪𝙘𝙩𝙨. 𝙒𝙚 𝙝𝙖𝙫𝙚 𝙖𝙡𝙡 𝙩𝙝𝙚 𝙥𝙡𝙖𝙨𝙩𝙞𝙘 𝙜𝙧𝙖𝙣𝙪𝙡𝙚𝙨 𝙪𝙨𝙚𝙙 𝙞𝙣 𝙖𝙪𝙩𝙤𝙢𝙤𝙩𝙞𝙫𝙚 𝙖𝙣𝙙 𝙖𝙪𝙩𝙤 𝙥𝙖𝙧𝙩𝙨 𝙖𝙣𝙙 𝙖𝙡𝙡 𝙩𝙝𝙚 𝙛𝙖𝙢𝙤𝙪𝙨 𝙘𝙤𝙢𝙥𝙖𝙣𝙞𝙚𝙨 𝙗𝙪𝙮 𝙩𝙝𝙚 𝙜𝙧𝙖𝙣𝙪𝙡𝙚𝙨 𝙛𝙧𝙤𝙢 𝙪𝙨.
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Hyundai hl730 3 wheel loader service repair manual
1.
2.
3. 5-28
GROUP 4 DISASSEMBLY AND ASSEMBLY
1.PRIORITYVALVE
STRUCTURE
6
2
5
4
2
3
1
9
7
8
1)
1 Plug
2 Seal ring
3 Orifice
4 Spool
5 Spring
6 Plug
7 Name plate
8 Drive screw
9 Housing
4. 5-29
DISASSEMBLY
Cleanliness is the primary means of
assuring satisfactory the priority valve life.
Select clean place.
Before removing the piping, clean the
surrounding area of valve ports.
3)
Ɠ
Loosen the LS plug using the 22mm open-
end spanner.
(2)
Screw out the PP plug using the 8mm
hexagon socket spanner.
Remove the seal ring.
(1)
PP
LS
TOOLS
şOpen-end spanner 22mm.
şNylon pin.
şHexagon socket spanner 8mm.
şTorque wrench.
şSocket spanner 22mm.
şHexagon socket spanner insert 8mm.
2)
6. 5-31
Put in the PP plug.
Remember seal ring.
ASSEMBLY
Guide the spool into the bore. Use the
nylon pin to center the spool in the bore.
(1)
5)
LS
PP
LS
PP
(2)
MODIFICATION
The control spring pressure can be altered by replacing the spring(See table below). Replace
name plate so that code no. and control spring pressure match each other again.
4)
(1)
L
d
Di
Control spring
pressure(bar)
4
7
d(mm)
1.8
2.0
Di(mm)
6.9
6.5
L(mm)
54
55
Cleaning
Clean all parts carefully in low aromatic kerosene.
Inspection and replacement
Check all parts carefully and make any replacements necessary. All seal rings must be replaced.
Lubrication
Before assembly, lubricate all parts with hydraulic oil.
(2)
(3)
(4)
7. 5-32
Guide the spring and LS plug into the
bore.
Remember seal ring.
LS
(3)
Tighten the LS plug with torque wrench
using a 22 socket spanner insert.
şTighten torque : 5.1Ź1kgfşm
(36.9Ź7.2lbfşft)
LS
(4)
Tighten the PP plug with a torque wrench
using a 8mm hexagon socket spanner
insert.
şTighten torque : 5.1Ź1kgfşm
(36.9Ź7.2lbfşft)
(5)
PP
The priority valve is now assembled.
(6)
PP
LS
8. 5-33
TROUBLESHOOTING
6)
Problem
Steering wheel
is heavy
(Steering wheel
is heavy at
engine low idle)
(Steering speed
is not high at
engine high idle)
Abnormal noise
Leakage
Cause
1. Relief valve of steering unit is clogged
with dirt.
2. Spool is stuck.
3. Orifice of plug and spool is clogged.
a. Pump is faulty.
b. Control pressure is low.
c. Piping is faulty.
d. Pump is faulty.
1. Relief valve of steering unit is clogged
with dirt.
2. Spool is stuck.
1. Loosen the plug.
2. O-ring is damaged.
Remedy
Disassembly, clean and reassembly.
Disassembly, clean and reassembly or
replace.
Disassembly, clean and reassembly.
Check pump.
Reset control pressure.
Replace piping.
Check pump.
Disassembly, clean and reassembly.
Disassembly, clean and reassembly or
replace.
Retighten the specified torque.
Replace.
9. 5-34
2.STEERINGUNIT
STRUCTURE
1)
1 Dust seal ring
2 Housing assy
3 Ball
4 Bushing
5 Roto Glyd ring
6 Bearing assy
7 Ring
16 Gearwheel set
17 End cover
18 Washer
20 Pin screw
21 Screw
24 Pilot relief valve
8 Cross pin
9 Spring set
10 Cardan shaft
12 O-ring
13 Intermediate plate
14 O-ring
15 Distributor plate
3
4
8
9 10
24
1
2 5
6
7
2
2
2
16
14
14
17
18
21
18
20
13
14
14
15
A
A
11. 5-36
DISASSEMBLY
Disassemble steering column from
steering unit and place the steering unit in
the holding tool. Screw out the screws in
the end cover(7-off-one rolled pin).
3)
Lift the gearwheel set with spacer
bushing(And spacer if fitted) off the unit.
Take out the two O-rings.
Remove the end cover, sideways.
(2)
(3)
Remove spacer bushing and spacer(If
fitted) from the gearwheel.
(4)
(1)
14. 5-39
Pull sleeve and spool out of the housing.
(13)
Take ring, bearing races and needle
bearing from sleeve and spool. The
outer(Thin) bearing race can sometimes
"stick" in the housing, therefore check that
it has come out.
(14)
Carefully pull the spool out of the sleeve.
(15)
Press the neutral position springs out of
their slots in the spool.
(16)
15. 5-40
Remove dust seal and O-ring.
(17)
The steering unit is now completely
disassembled.
Cleaning
Clamp all parts carefully in Shellsol K or the
like.
Inspection an replacement
Replace all seals and washer. Check all
parts carefully and make any replacements
necessary.
Lubrication
Before assembly, lubricate all parts with
hydraulic oil.
(18)
16. 5-41
ASSEMBLY
Assemble spool and sleeve.
The sleeve and spool are correctly
assembled when
The slots-in sleeve and spool-for the
neutral position springs are opposite
each other and
One of the 3 T-shaped grooves(A) in the
spool is opposite one of the sets(B) of
small holes in the sleeve.
4)
Place the curved springs between the flat
ones and press them into place.
(3)
Line up the spring set.
Place the two flat neutral position springs
in the slot.
(2)
(1)
(4)
B A
Ɠ
ڸ
ڹ
17. 5-42
Guide the spool into the sleeve.
(5)
Press the springs together and push the
neutral position springs into place in the
sleeve.
(6)
Line up the springs and center them.
(7)
Guide the ring down over the sleeve.
The ring should be able to rotate-free of
the springs.
(8)
Ɠ
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19. 5-43
Fit the cross pin into the spool/sleeve.
(9)
Fit bearing races and needle bearing as
shown on below drawing.
(10)
1 Outer bearing race
2 Needle bearing
3 Inner bearing race
4 Spool
5 Sleeve
) Inside chamfer on inner bearing race
must face inner spool.
Grease O-ring and kin-ring with hydraulic
oil and place them on the tool. See next
page.
(11)
5
4
3
2
1
*
20. 5-44
Put the steering unit in the holding tool
keeping the bore vertical. Guide the outer
part of the assembly tool into the bore.
Guide the inner part of the tool right to the
bottom.
(12)
Press and turn the O-ring into position in
the housing. Draw the inner and outer
parts of the assembly tool out of the
steering unit bore, leaving the guide in the
bore.
(13)
Take the steering unit out of the holding
tool and place it horizontally. With a light
turning movement, guide the spool and
sleeve into the bore.
(14)
21. 5-45
The spool set will push out the assembly
tool guide. The O-ring is now in position.
(15)
Put the steering unit back into the holding
tool keeping the bore vertical. Place the
cross pin in the spool/sleeve so that it is
parallel to the port flange.
(16)
Put the ball into the hole indicated by the
arrow.
(17)
Screw the threaded bushing lightly into the
bore. The top of the bushing must lie just
below the surface of the housing.
(18)
22. 5-46
Grease the O-ring with mineral oil
approximate viscosity 500cSt at 20Ş
C and
place it in the groove.
(19)
Place the intermediate plate so that the
channel holes match the holes in the
housing.
(20)
Grease the O-ring with mineral oil
approximate viscosity 500cSt at 20Ş
C and
place it in the groove.
(21)
Place the distributor plate so that the
channel holes match the holes in the
intermediate plate and the housing.
(22)