English 
Parts list
|
No. |
Part No. |
Description |
Qty |
|
- |
31Q6-19111 |
Main Control Valve |
1 |
|
- |
31Q6-19112 |
Main Control Valve |
1 |
|
- |
31Q6-19113 |
Main Control Valve |
1 |
|
N1 |
31Q8-17610 |
Housing-P1 |
1 |
|
- |
31Q8-17611 |
Housing-P1 |
1 |
|
3 |
32Q6-17630 |
Spool Kit-Travel |
1 |
|
5 |
31N6-17681 |
Spool Assy-Boom 1 |
1 |
|
6 |
32Q6-17660 |
Spool Kit-Bucket |
1 |
|
8 |
31Q8-17680 |
Spool Kit-Arm 2 |
1 |
|
12 |
XKBF01447 |
Spool-Bucket |
1 |
|
14 |
31N8-17320 |
Valve Assy-Holding |
1 |
|
N90 |
31N8-17330 |
Holding Valve Kit |
1 |
|
90-1 |
31N8-18380 |
Poppet-Main |
1 |
|
90-2 |
31N8-18400 |
Restrictor |
1 |
|
90-3 |
31N8-18480 |
C-Ring |
1 |
|
90-4 |
31N8-18430 |
Poppet-Seat |
1 |
|
90-5 |
S641-010102 |
Ring-Back Up |
1 |
|
90-6 |
S631-10A004 |
O-Ring |
1 |
|
90-7 |
31N8-19650 |
O-Ring |
1 |
|
90-8 |
31N8-18390 |
Spring-Pilot |
1 |
|
N90-9 |
31N8-18420 |
Pilot Poppet-H/D |
1 |
|
90-10 |
31N8-18450 |
Guide-Poppet |
1 |
|
N91 |
31N8-17340 |
Holding Valve Kit |
1 |
|
91-1 |
31N8-18160 |
Block-Holding |
1 |
|
N91-2 |
31N8-18410 |
Guide-Piston |
1 |
|
91-3 |
31N8-18470 |
Piston 2-Main |
1 |
|
91-4 |
31N8-18440 |
Piston-Pilot |
1 |
|
91-5 |
31N8-18460 |
Spring 1 |
1 |
|
91-6 |
31N8-18620 |
Plug-Pf1/2 |
1 |
|
91-7 |
S631-018004 |
O-Ring |
1 |
|
91-8 |
31N8-18680 |
Plug |
1 |
|
16 |
31Q8-17790 |
Valve Assy-Port Relief |
1 |
|
17 |
31Q8-17810 |
Valve Assy-Port Relief |
1 |
|
22 |
31Q8-17780 |
Valve Assy-Main Relief |
1 |
|
23 |
31N8-17420 |
Valve-Check |
1 |
|
24 |
31N6-17740 |
Valve Assy-Negacon |
1 |
|
25 |
31N8-17440 |
Orifice-Signal |
1 |
|
28 |
31N8-17520 |
Plug-Load Check |
5 |
|
29 |
31N8-17510 |
Plug-Load Check |
5 |
|
30 |
31N4-17900 |
Plug Kit |
1 |
|
31 |
31N8-17550 |
Plug |
3 |
|
38 |
31N8-18140 |
Cover B1-Pilot |
4 |
|
42 |
31N8-18370 |
Poppet-Bkt L/C |
1 |
|
43 |
31N8-18190 |
Poppet 1-L/C |
4 |
|
44 |
31N8-18200 |
Spring 1-L/C |
5 |
|
45 |
31N8-18220 |
Poppet 2-L/C |
4 |
|
46 |
31N8-18230 |
Spring 2-L/C |
4 |
|
47 |
31N8-18530 |
Poppet-Signal |
1 |
|
48 |
31N8-18540 |
Spring-Signal |
1 |
|
49 |
31N8-18680 |
Plug |
2 |
|
50 |
31N8-19410 |
Name Plate |
1 |
|
51 |
31N8-19490 |
Rivet-Screw Type |
2 |
|
52 |
31Q6-17910 |
Flange-Port Plug |
1 |
|
53 |
31N8-18980 |
Cover 1 |
7 |
|
54 |
31N8-18990 |
Gasket 1 |
7 |
|
55 |
31Q8-18910 |
Cover 3 |
1 |
|
56 |
31Q8-18920 |
Gasket 3 |
1 |
|
62 |
31N8-19630 |
O-Ring |
5 |
|
63 |
S632-030004 |
O-Ring |
1 |
|
64 |
S107-080454 |
Bolt-Socket |
8 |
|
66 |
S107-081054 |
Bolt-Socket |
5 |
|
67 |
S107-100156 |
Bolt-Socket |
24 |
|
68 |
S107-100204 |
Bolt-Socket |
5 |
|
69 |
S107-101454 |
Bolt-Socket |
4 |
|
72 |
S107-161704 |
Bolt-Socket |
4 |
|
73 |
S411-080006 |
Washer-Spring |
12 |
|
74 |
S411-160006 |
Washer-Spring |
4 |
|
75 |
31N8-19430 |
Cap-Dust |
1 |
|
76 |
31N8-19440 |
Cap-Dust |
1 |
|
77 |
31N8-19450 |
Cap-Dust |
7 |
|
78 |
31N8-19460 |
Cap-Dust |
4 |
|
NK |
31N8-17330 |
Holding Valve Kit |
1 |
|
NK |
31N8-17340 |
Holding Valve Kit |
1 |
|
Component Position |
Primary Part Number |
Alternative / Related Number |
Maintenance Suggestion |
|
Main Control Valve (MCV) |
31N8-17330 |
31N8-17340 |
Restores hydraulic responsiveness; fix for sluggish multi-function movements. |
|
Main Hydraulic Pump |
31N8-15120 |
31N8-15130 |
Critical for maintaining system pressure; replace when cycle times become slow. |
|
Swing Motor |
31N8-11110 |
31N8-11120 |
Prevents oil leakage into the swing gearbox; ensures smooth 360° rotation. |
|
Travel Motor (Final Drive) |
31N8-40110 |
31N8-40120 |
Heavy-duty seals designed for the high-torque demands of the undercarriage. |
|
Boom Cylinder |
31Q6-01601 |
31Q6-01611 |
Essential for lifting power; prevents "boom drift" during heavy loading. |
|
Arm / Stick Cylinder |
31Q6-01621 |
31Q6-01631 |
High-wear component; check for internal leaks to maintain digging precision. |
|
Bucket Cylinder |
31Q6-01641 |
31Q6-01651 |
Most active cylinder; high-frequency replacement part for professional service. |
|
Center Joint (Swivel) |
31N8-01310 |
31N8-01320 |
Crucial for fluid transfer between the upper and lower excavator structure. |
Product Description
High-Precision Main Control Valve Service Repair Kit for Hyundai R220LC-9S
Restore the hydraulic responsiveness and multi-function coordination of your Hyundai R220LC-9S with this premium Main Control Valve (MCV) Seal Kit. As the central hub of your excavator's hydraulic system, the MCV requires high-precision sealing to prevent internal pressure loss and erratic movement. This kit (Part Numbers 31N8-17330 and 31N8-17340) is engineered for professional-grade overhauls.
At Toparts, we understand that a leaking control valve can lead to sluggish operation and increased fuel consumption. Our seal kits are manufactured from advanced materials designed to withstand high-pressure spikes and maintain dimensional stability in extreme temperatures.
Product Features:
Exact Fitment: Specially designed for the Hyundai R220LC-9S excavator main control valve (MCV) system.
Dual Part Number Support: Fully compatible with OEM numbers 31N8-17330 and 31N8-17340.
Superior Material Grade: Features high-performance Nitrile (NBR) and PTFE components for exceptional oil resistance and low friction.
Leak-Free Reliability: Precision-engineered to prevent internal bypass and external oil seepage, ensuring all hydraulic functions (boom, arm, bucket, swing) operate smoothly.
Comprehensive Kit: Includes all required O-rings, back-up rings, and specialized seals for a complete valve block service.
Technical Specifications:
Machine Brand: Hyundai
Model: R220LC-9S
Component Type: Main Control Valve (MCV) / Multi-Way Valve
Part Numbers: 31N8-17330, 31N8-17340
Category: Hydraulic Control System Repair
Condition: Brand New Aftermarket Replacement
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