Resaltar:
Hyunsang excavator O-Ring seal
, WA470-3 O-Ring construction part
, D21A-8 excavator seal with warranty
1. Quick Details of seal 07000-72020:
| Part NO. |
07000-72020 |
| Machine |
Crawler Dozer |
| Size |
5.7 mm thickness |
| Material |
SILICON |
| Oil seal type |
O RING |
2. 07000-72020 parts on group :
| NO. |
PART NO. |
PRAT NAME |
QTY |
| 1 |
103-15-00600 |
TRANSMISSION ASSEMBLY |
1 |
| 2 |
103-15-00710 |
VALVE ASSEMBLY,MODULATION |
1 |
| 3 |
104-15-25110 |
BODY |
1 |
| 4 |
104-15-25210 |
SPOOL,MODULATING |
1 |
| 5 |
103-15-35250 |
SPRING |
1 |
| 6 |
103-15-35260 |
SPRING |
1 |
| 7 |
103-15-35220 |
VALVE |
1 |
| 8 |
113-15-25270 |
SHIM, 0.2MM |
2 |
| 9 |
113-15-25260 |
SHIM, 0.5MM |
3 |
| 10 |
103-15-35270 |
SHIM, 0.5MM |
3 |
| 11 |
104-15-25490 |
VALVE |
1 |
| 12 |
125-15-15290 |
SPRING |
1 |
| 13 |
104-15-25480 |
VALVE |
1 |
| 14 |
361-15-15320 |
SPOOL,QUICK RETURN |
1 |
| 15 |
104-15-25330 |
STOPPER |
2 |
| 16 |
07000-73025 |
O-RING |
2 |
| 17 |
104-15-25340 |
STOPPER |
2 |
| 18 |
07000-72020 |
O-RING |
2 |
| 19 |
103-15-25350 |
PLATE |
2 |
| 20 |
01010-50820 |
BOLT |
4 |
| 21 |
01643-30823 |
WASHER |
4 |
| 22 |
103-15-00740 |
SEAT ASSEMBLY |
1 |
| 23 |
04260-00635 |
BALL |
1 |
| 24 |
103-15-35140 |
GASKET |
1 |
| 25 |
01010-51025 |
BOLT |
2 |
| 26 |
01643-31032 |
WASHER |
2 |
| 27 |
103-15-35910 |
GASKET |
1 |
| 28 |
01010-50860 |
BOLT |
2 |
| 29 |
01010-50870 |
BOLT |
6 |
| 30 |
01643-30823 |
WASHER |
8 |
| 31 |
103-15-31770 |
SLEEVE |
1 |
| 32 |
07000-72014 |
O-RING |
2 |
3.07000-72020 picture:
4. Service part number :
| PART NO. |
PART NO. |
Part NO. |
| 707-35-52690 |
707-51-45640 |
707-99-75600 |
| 707-35-52700 |
707-51-14640 |
707-99-76030 |
| 707-35-52740 |
707-51-45640 |
707-51-80640 |
| 707-35-52750 |
707-51-45650 |
707-51-11640 |
| 707-35-52760 |
707-51-50640 |
707-51-11650 |
| 707-35-52770 |
707-51-55630 |
707-51-11690 |
| 707-35-52780 |
707-51-55640 |
707-51-12630 |
| 707-35-52830 |
707-51-60640 |
707-51-12640 |
| 707-35-52860 |
707-51-60650 |
707-51-12650 |
| 707-35-52880 |
707-51-65630 |
707-44-10911 |
| 707-35-52900 |
707-51-65640 |
707-98-58230 |
| 707-35-52910 |
707-51-65650 |
707-98-58240 |
| 707-99-64080 |
707-51-19640 |
707-98-60100 |
| 707-99-64120 |
707-98-37600 |
707-99-77240 |
| 707-98-61100 |
707-98-37610 |
707-35-52700 |
5. FAQ
Q: What are these O-rings and what do they do?
A: These are precision elastomeric O-rings, designed for static and dynamic sealing in small bore applications like valves, fuel injectors, and hydraulic fittings. They prevent fluid or gas leaks while maintaining pressure integrity.
Q: What material are these red O-rings typically made of?
A: The red color most commonly indicates silicone rubber (VMQ). They can also be high-grade nitrile (NBR) or fluorosilicone (FVMQ), but silicone is the most typical material for small red O-rings.
Q: What are the key properties of silicone rubber for these O-rings?
A: Silicone offers excellent heat resistance (operating range: -60°C to +200°C), good flexibility at low temperatures, and strong resistance to ozone and aging. It works well with air, steam, and non-polar fluids, though it is not recommended for most mineral oils or fuels.
Q: How do I install these small O-rings correctly?
A: Start by thoroughly cleaning the groove and mating surfaces to remove dirt or burrs. Lightly lubricate the O-ring with a compatible fluid to ease installation. Carefully fit the O-ring into the groove, ensuring it does not twist or overstretch. When assembling components, avoid pinching the seal with sharp edges.
Q: What common mistakes cause these O-rings to fail early?
A: Common issues include twisting or overstretching during installation, using the wrong size, chemical incompatibility with the system fluid, extreme temperatures causing brittleness, and reusing old O-rings.
Q: What common issues cause O-ring failure?
A: Common causes include improper installation (twisting, pinching, or overstretching), chemical incompatibility with the fluid, excessive heat or cold leading to hardening or brittleness, surface scratches on mating parts, and using the wrong size or durometer.
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