برجسته کردن:
O Ring Seals for D21AG-7
, O Ring Seals for D21P-6A
, Engineering Machinery O Ring Seals
1. Quick Details of seal 07000-72021:
| Part NO. |
07000-72021 |
| Machine |
Crawler Dozer |
| Size |
5.7 mm thickness |
| Material |
SILICON |
| Oil seal type |
O RING |
2. 07000-72021 parts on group :
| NO. |
PART NO. |
PRAT NAME |
QTY |
| 1 |
103-15-00601 |
TRANSMISSION ASSEMBLY |
1 |
| 2 |
103-15-00600 |
TRANSMISSION ASSEMBLY |
1 |
| 3 |
103-15-00720 |
VALVE ASSEMBLY,SELECTOR AND INCHING |
1 |
| 4 |
363-15-15410 |
BODY |
1 |
| 5 |
07043-00108 |
PLUG |
1 |
| 6 |
07042-20108 |
PLUG |
2 |
| 7 |
07040-11209 |
PLUG |
1 |
| 8 |
07002-01223 |
O-RING |
1 |
| 9 |
113-15-29110 |
SEAL,OIL |
2 |
| 10 |
363-15-15430 |
SPOOL,DIRECTIONAL |
1 |
| 11 |
363-15-15450 |
SPOOL,SPEED |
1 |
| 12 |
09363-00850 |
YOKE |
2 |
| 13 |
01580-10806 |
NUT |
2 |
| 14 |
113-15-25481 |
PLUG |
2 |
| 15 |
07002-01823 |
O-RING |
2 |
| 16 |
103-15-15340 |
DETENT ASSEMBLY |
2 |
| 17 |
04260-00635 |
BALL |
1 |
| 18 |
103-15-15350 |
SPRING |
1 |
| 19 |
103-15-15330 |
RETAINER |
1 |
| 20 |
07002-01223 |
O-RING |
2 |
| 21 |
363-15-15510 |
SPOOL,INCHING |
1 |
| 22 |
104-15-35170 |
STOPPER |
1 |
| 23 |
103-15-36160 |
SPRING |
1 |
| 24 |
363-15-15530 |
STOPPER |
1 |
| 25 |
103-15-36150 |
SPRING |
1 |
| 26 |
104-15-36490 |
SHIM, 0.2MM |
4 |
| 27 |
104-15-36480 |
SHIM, 0.5MM |
6 |
| 28 |
363-15-15520 |
VALVE |
1 |
| 29 |
22W-75-18890 |
VALVE |
1 |
| 30 |
125-15-15290 |
SPRING |
1 |
| 31 |
22W-75-18880 |
VALVE |
1 |
| 32 |
124-15-45450 |
PLUG |
1 |
| 33 |
07002-03034 |
O-RING |
1 |
| 34 |
104-15-35230 |
COVER |
1 |
| 35 |
113-15-29110 |
SEAL,OIL |
1 |
| 36 |
07000-72021 |
O-RING |
1 |
| 37 |
104-15-36470 |
SHIM, 0.2MM |
6 |
| 38 |
104-15-36460 |
SHIM, 0.5MM |
4 |
| 39 |
01010-50825 |
BOLT |
2 |
| 40 |
01643-30823 |
WASHER |
2 |
| 41 |
103-15-35920 |
GASKET |
1 |
| 42 |
01010-50850 |
BOLT |
6 |
| 43 |
01010-50855 |
BOLT |
2 |
| 44 |
01010-50875 |
BOLT |
4 |
| 45 |
01643-30823 |
WASHER |
12 |
3. 07000-72021 picture:
4. Service part number :
| PART NO. |
PART NO. |
Part NO. |
| 707-35-52670 |
707-51-45640 |
707-99-75600 |
| 707-35-91100 |
707-51-11640 |
707-51-80640 |
| 707-35-91130 |
707-51-11650 |
707-98-36600 |
| 707-35-91140 |
707-44-85180 |
707-98-25870 |
| 707-35-91200 |
707-44-10150 |
707-51-14110 |
| 707-35-91220 |
707-44-85150 |
707-51-14130 |
| 707-35-91250 |
707-44-90070 |
707-51-16030 |
| 707-35-91311 |
707-44-90080 |
707-98-27100 |
| 707-35-91320 |
707-44-90180 |
707-51-16130 |
| 707-35-91440 |
707-44-90150 |
707-51-17030 |
| 707-35-91550 |
707-44-95150 |
707-51-17130 |
| 707-35-52830 |
707-44-10080 |
707-51-18030 |
| 707-51-70630 |
707-44-10180 |
707-98-37580 |
| 707-51-70650 |
707-98-60120 |
707-51-20250 |
| 707-99-77240 |
707-98-60121 |
707-35-52700 |
5. FAQ
Q: What material are these red O-rings typically made of?
A: The red color most commonly indicates silicone rubber (VMQ). Depending on the specific use case, they can also be high-temperature nitrile (NBR) or fluorosilicone (FVMQ), but silicone is the standard material for red O-rings.
Q: What are the key properties of silicone rubber for these O-rings?
A: Silicone offers excellent heat resistance (operating range roughly -60°C to +200°C), great flexibility even at low temperatures, and strong resistance to ozone, weathering, and aging. It works well with hot air, steam, and non-polar fluids, though it is not recommended for use with most mineral oils or fuels.
Q: How do I install these O-rings correctly?
A: Start by thoroughly cleaning the O-ring groove and mating surfaces to remove all dirt, burrs, or old seal residue. Lightly lubricate the O-ring with a compatible fluid or grease to ease installation. Carefully fit the seal into the groove, making sure it does not twist, overstretch, or get pinched. When assembling components, avoid sharp edges that could damage the seal.
Q: What common mistakes cause these O-rings to fail early?
A: The most frequent causes are improper installation (twisting, pinching, or overstretching), chemical incompatibility with the system fluid, extreme temperatures leading to hardening or brittleness, scratches on mating surfaces, and using the wrong size or hardness (durometer) for the application.
Q: What are the key properties of silicone rubber for this seal?
A: Silicone offers excellent heat resistance (operating range roughly -60°C to +200°C), great flexibility even at low temperatures, and strong resistance to ozone, weathering, and aging. It works well with hot air, steam, and non-polar fluids, though it is not recommended for use with most mineral oils or fuels.
Q: How long can a properly installed silicone O-ring last?
A: In static applications with clean conditions and within rated temperatures, silicone O-rings can last for many years. In dynamic applications or with incompatible fluids, their lifespan will be significantly shorter.
Q: Can I reuse these O-rings after removing them?
A: No, reusing is never recommended. Once an O-ring has been compressed or stretched during installation, it can develop permanent deformation or hidden damage. Always install a new O-ring during reassembly to ensure a reliable, leak-proof seal.
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