PC78-6 PC78UU-8 Swing Motor Assembly
High-performance hydraulic swing motor designed for PC78-6 excavator models. Compatible with part numbers 21W-26-51020, 21W-26-00102, 708-7T-00250, and 708-7T-00251. This complete motor assembly includes all necessary swing motor components and piston motor parts for reliable excavator operation.
Reverse-Prevention Safety System
The PC78-6 swing motor incorporates a built-in reverse-prevention valve that eliminates unintended reverse rotation, preventing operational errors and safety hazards.
- One-way valve design ensures hydraulic oil flows in only one direction
- Prevents motor reversal due to external forces or hydraulic fluctuations
This critical safety feature is especially important during heavy lifting operations where reverse rotation could cause load drops and serious accidents. The high-flow capacity valve maintains normal motor operation and response speed while delivering reliable performance under high hydraulic pressure and frequent use conditions.
Product Specifications
| Model |
PC50UU-2 |
| Category |
Excavator Swing Hydraulic Motor |
| Brand |
TGFQ |
| Part Numbers |
21W-26-51020/21W-26-00102/708-7T-00160 |
| Packing |
Wooden case |
| Delivery Time |
1-3 days after payment confirmation |
| Shipping Methods |
By Sea, Air, or Express |
Quality Assurance
Each unit undergoes thorough inspection and detailed photos are provided for buyer confirmation before shipping to ensure product quality and satisfaction.
Hydraulic Motor Applications
Hydraulic motors are essential components in earthmoving equipment including excavators, backhoe loaders, skid-steer loaders, forklifts, heavy dump trucks, and bulldozers. They power hydraulic cylinders that extend and retract during various operational cycles.
Swing Brake Operation
The swing brake features a multi-disc and plate assembly located in the first stage planetary gear. This spring-applied, hydraulically-released system functions as a parking brake and is not designed for cyclic service braking. Discs and plates are lubricated by the release signal oil for optimal performance and longevity.
Product Images
Swing Motor Parts Breakdown
| Position |
Part Number |
Part Name |
Quantity |
| 1 |
708-7T-11240 |
• CASE |
1 |
| 2 |
708-7T-11650 |
• COVER,END |
1 |
| 3 |
708-7T-51210 |
• O-RING |
1 |
| 4 |
720-68-19610 |
• PIN |
3 |
| 5 |
01010-51250 |
• BOLT |
4 |
| 6 |
708-7T-12220 |
• SHAFT |
1 |
| 7 |
708-7T-12240 |
• BEARING |
1 |
| 8 |
708-7T-12250 |
• BEARING |
1 |
| 9 |
708-7T-12230 |
• SEAL,OIL |
1 |
| 10 |
04065-04518 |
• RING,SNAP |
1 |
| 11 |
708-7T-05020 |
• SPACER KIT |
1 |
| 12 |
708-7T-13421 |
• PLATE,THRUST |
1 |
| 13 |
708-7T-13510 |
• GUIDE |
1 |
| 14 |
708-7T-13570 |
• SPRING |
1 |
| 15 |
708-7T-13530 |
• WASHER |
2 |
| 16 |
708-7T-13540 |
• PIN |
3 |
| 17 |
04065-03815 |
• RING,SNAP |
1 |
| 18 |
708-7T-13611 |
• PISTON SUB ASS'Y |
7 |
| 19 |
708-7T-13342 |
• RETAINER,SHOE |
1 |
| 20 |
708-7T-13140 |
• BLOCK,CYLINDER |
1 |
| 21 |
708-7T-13261 |
• PLATE,VALVE |
1 |
| 21 |
708-7T-13260 |
• PLATE,VALVE |
1 |
| 22 |
706-73-72420 |
• VALVE |
2 |
| 23 |
706-73-72440 |
• SPRING |
2 |
| 24 |
706-73-72430 |
• PLUG |
2 |
| 25 |
07002-12434 |
• O-RING |
2 |
| 26 |
708-7T-52512 |
• PLATE |
3 |
| 27 |
708-7T-15120 |
• DISC |
2 |
| 28 |
708-7T-15140 |
• PISTON,BRAKE |
1 |
| 29 |
07000-12130 |
• O-RING |
1 |
| 30 |
708-7T-55220 |
• O-RING |
1 |
| 31 |
708-7T-15150 |
• SPRING |
4 |
| 32 |
708-7T-13710 |
• SPACER |
1 |
Warehouse & Inventory Capacity
Our facility includes over 4000 square meters of three-dimensional warehouse space plus 2000 square meters of outdoor storage, ensuring adequate inventory levels and rapid response to customer requirements. Fast delivery is our competitive advantage.
Frequently Asked Questions
Can I order a sample for testing first?
Yes, we welcome sample orders for testing and evaluation.
How do I place an order?
Simply provide the model and quantity you need. We will issue a proforma invoice, and upon payment confirmation, your order will be processed. Preparation time varies based on order complexity.
Do you have your own factory?
Yes, we operate our own manufacturing facility with 23 years of specialized experience in the excavator gear industry.
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