707-44-70070 7074470070 RING,PISTON OF D21A-8 D20PG-7A
1. Quick Details of seal 707-44-70070:
| Part NO. | 707-44-70070 |
| Machine | Excavator |
| Size | OEM |
| Material | NBR |
| Type | RING SEAL |
2. 707-44-70070 parts on group :
| NO. | PART NO. | PRAT NAME | QTY |
| 1 | 707-11-70840 | CYLINDER,L.H. | 1 |
| 707-11-70850 | CYLINDER,R.H. | 1 | |
| 2 | 02896-11009 | O-RING (KIT) | 2 |
| 3 | 07143-10404 | BUSHING | 1 |
| 4 | 07145-00040 | SEAL,DUST (KIT) | 2 |
| 5 | 707-29-70821 | HEAD,CYLINDER | 1 |
| 6 | 07177-03525 | BUSHING | 1 |
| 7 | 707-51-35210 | PACKING,ROD (KIT) | 1 |
| 8 | 175-63-75190 | SEAL,DUST (KIT) | 1 |
| 9 | 07179-12047 | RING,SNAP | 1 |
| 10 | 07000-12065 | O-RING (KIT) | 1 |
| 11 | 07146-02066 | RING,BACK-UP (KIT) | 1 |
| 12 | 07000-12070 | O-RING (KIT) | 1 |
| 13 | 721-58-35410 | ROD,PISTON | 1 |
| 14 | 707-76-35050 | BUSHING | 1 |
| 15 | 07145-00035 | SEAL,DUST (KIT) | 2 |
| 16 | 707-36-70930 | PISTON | 1 |
| 17 | 707-44-70070 | RING,PISTON (KIT) | 1 |
| 18 | 07156-00710 | RING,WEAR (KIT) | 1 |
| 19 | 707-67-24010 | NUT | 1 |
| 20 | 707-86-39270 | TUBE,L.H. | 1 |
| 707-86-39280 | TUBE,R.H. | 1 | |
| 21 | 02896-11009 | O-RING (KIT) | 1 |
| 22 | 01010-81040 | BOLT | 1 |
| 23 | 01643-31032 | WASHER | 1 |
3. 707-44-70070 picture:
4. Service part number :
| PART NO. | PART NO. | Part NO. |
| 707-51-14110 | 707-98-25870 | 707-98-36630 |
| 707-98-64410 | 707-98-39700 | 707-98-66410 |
| 707-98-64420 | 707-98-37680 | 707-98-56210 |
| 707-98-64450 | 707-98-64450 | 707-98-56600 |
| 707-98-25910 | 707-98-36700 | 707-98-56610 |
| 707-99-64150 | 707-99-77250 | 707-51-95650 |
| 707-99-64152 | 707-99-77300 | 707-98-26441 |
5. FAQ
Q: Which construction machine does part number 707-44-70070 fit for?
A: Part number 707-44-70070 piston seal ring is matched for excavator arm hydraulic cylinder.
Q: What is the part name and classification of component 707-44-70070?
A: The part name of 707-44-70070 is piston seal ring and it belongs to piston seal ring category.
Q: What materials are adopted for manufacturing this piston seal ring?
A: It uses bronze filled PTFE sliding layer with FKM rubber energizer for oil resistance.
Q: What core function does this piston seal ring perform in hydraulic cylinder?
A: It stops internal hydraulic oil bypass between piston and cylinder wall to sustain cylinder pushing force.
Q: Where is this piston seal ring mounted inside the hydraulic cylinder?
A: It is fitted into the precision groove on the piston of excavator arm cylinder.
Q: What benefits can FKM rubber bring to this sealing assembly?
A: FKM offers outstanding resistance to high temperature and aged hydraulic oil.
Q: What precaution should be taken during on-site installation?
A: Lubricate the seal ring with clean hydraulic oil before assembly to prevent tearing.
Q: What symptom will occur once this piston seal ring is worn out?
A: The arm will move slowly and cannot hold load steadily under digging operation.
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