Control Valve Specifications; Tightening Torque For Aluminum Cap/Port Joint (Pipe); Pressure Receiving Characteristic Of Main Spoo; Pressure Receiving Characteristic Of Travel Independent And Other Valves - Kubota KX080-3 Workshop Manual

WSM KX080-3 Mechanism
ID No. Part name Q'ty Remarks
1
2
3 Valve housing 1
4 Relief valve kit 1 A1 30.4 0.3MPa at 5L/min
5 Spool 1
6 Spool 1
7 Spool 1
8 Spool 1
9 Cap 4
10 Cap 4
11 Spool end 4
12 Spring 4
13 Spring seat 8
14 Plug 8
15 Spool 1
16 Spool 1
17 Poppet 4
18 Plug assembly 3
19 Poppet 1
20 Spring 1
21 Plug assembly 1
22 Plug assembly 6
23 O-ring 16
24 Plug 8
25 Poppet 8
26 Spring 8
27 Spool 1
28 Spool 1
29 O-ring 8 JISB2401,1A, P26
30 Plug assembly 1
31 Relief valve kit 1 P(L5) 27.4 0.3MPa at 48L/min
32 Spool 1
33 Plug 1
34 Stopper 1
35 Set-screw 1 JISB1177, M8x25L
36 Nut 1 JISB1181, M8
37 Spring 1
38 O-ring 1 JISB2401,1B, P12
39 Backup ring 1 JISB2407,P12, T2
40 O-ring 1 JISB2401,1B, P24
41 Sleeve 1
42 Plug assembly 2
43 O-ring 1 JISB2401,1B, P16
44 Backup ring 2 JISB2407,P16, T2
45 Socket head bolt 16 JISB1176, M6x20L
46 Plug assembly 1
47 Plug assembly 2
48 Nameplate 1
49 Drive screw 2
50
ID No. Part name Q'ty
51
52
53
54 O-ring 1 JISB2401, 1A, G70
55 O-ring 1 JISB2401, 1A, G75
56 O-ring 1 JISB2401, 1B, P7
57 Spring seat 1
58
59
60 Tie-rod 4
61 Tie-rod 4
62 Nut 8
63 Spool section assembly 1 Swing
64 Outlet housing 1 Outlet
65 Spool section assembly 1 Travel independent valve
66 Spool section assembly 1 Travel
67 Spool section assembly 1 Travel
68 Spool section assembly 1 Confluence valve
69 Spool section assembly 1 S/PS
70 Spool section assembly 1 Dozer
71 Spool section assembly 1 Swivel
72 Outlet section assembly 1 P3 bypass valve
73 Relief valve kit 5 B1,A2,B2,A4,B4
31.4 0.3MPa at 5L/min
74 Relief valve kit 3 A3,B3,AK4
20.6 0.3MPa at 5L/min
75 Relief valve kit 1 BK4
11.8 0.3MPa at 5L/min
76 Relief valve kit 2 P1,P2
29.4 0.3MPa at 43L/min
77 Relief valve kit 1 P3
20.6 0.3MPa at 66L/min
78 Shut-off valve assembly 3 AK3, BK3, A5
79 Anti-void valve assem- 1 B5
bly
IV-M-30
Remarks

2. Control valve specifications

1. Maximum flow rate:
2. Maximum pressure:
3. Operating oil temperature range:
4. Operating hydraulic oil type:
5. Main relief vale pressure setting: P1, P2 (travel independent valve); 29.4
6. Unload valve pressure setting:
7. Overload relief valve pressure set-
ting:
8. Pilot air bleeding area
9 Equipped with S/P2 spool stroke adjustment mechanism:
10 Pump LS control pressure difference setting:
11. Genuine Kubota part code:

Tightening torque for aluminum cap/port joint (pipe)

Port size
Ports applied
Recommended tighten-
ing torque
Maximum torque
Thread breaking torque
Conditions
Remarks
Others
Pilot pressure
Fig. 1 Pressure receiving characteristic of main spool
P1, P2; 72 L/min, P3; 66 L/min
P1, P2; 29.4 MPa, P3; 20.6 MPa
253 to 368 °K (-20 to 100°C)
ISO VG46 or equivalent
0.3 MPa at 43 L/min
P LS ; 27.4 0.3 MPa at 48 L/min
P3; 20.6 0.3 MPa at 66 L/min
2.45 0.1 MPa at 26 L/min
Arm A1; 30.4
B1; 31.4
Bucket A2; 31.4
B2; 31.4
S/P A3; 20.6
B3; 20.6
Boom A4; 31.4
B4; 31.4
Blade AK4; 27.4
BK4; 11.8
Swivel, dozer, travel, swing, S/P2, arm, S/P1,
bucket, boom
Adjustable range; 2
1.5 MPa
RO809-61131
PF1/4 Port name
pa5, pb5, T1
pak1 2, pak 4 5, pbk 1 2, pbk 4 5
P1, P2, T2, P
34.3 N m
A1 A4, B1
P3, P4, A5, B5,
39.2 N m AK1 AK5, BK1
PB1 , PB2
44.1 N m
Pa1 Pa5, Pb1
Standard-size joint (threaded-part
Pak1 Pak5, Pbk1
length 12)
PP1 PP3, PPS, PLS, PAI,
Be careful not to apply any torque over
PF1, PF2, PT, Dr1, Dr2, Pbu1
maximum one.
Swing
Travel independent
valve
Pilot pressure
Fig. 2 Pressure receiving characteristic of travel inde-
pendent and other valves
IV Hydraulic System
0.3 MPa at 5 L/min
0.3 MPa at 5 L/min
0.3 MPa at 5 L/min
0.3 MPa at 5 L/min
0.3 MPa at 5 L/min
0.3 MPa at 5 L/min
0.3 MPa at 5 L/min
0.3 MPa at 5 L/min
0.3 MPa at 5 L/min
0.3 MPa at 5 L/min
8 mm
Port size
PF1-1/4
PF3/4
B4 7/8-14UNF
PF1/2
BK5, T3
PF3/8
Pb5, PF1/4
Pbk5,
Confluence valve
P3 bypass valve
(PF2 and PT applied at the
same time)