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QH70 G9910
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Shanghai, China
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T/T , Paypal , Union
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Carton
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QD70 (G9910) Bottom Power Take Off PTO Assembly 24/35 for Crane Truck Fast Transmission
Fast 9-Speed Transmission (Crane Application)
QD70 (G9910) Ratio 0.7 For crane truck 9-speed gearbox bottom transmission power take-off
QD70 (G9910) Bottom-Mounted PTO Assembly for Fast 9-Speed Transmission (Crane Application)
1. Core Model & Compatibility
Assembly Model: QD70 (Drawing No. G9910)
Compatible Transmissions: Fast 9-speed twin-countershaft series (9JS119TA, 9JS150A, RT-11509C, etc.)
PTO Type: Bottom-mounted (gear-driven), taking power from the main case's bottom port
Applications: 70-ton class truck cranes (e.g., ZTC700V, QAY70), heavy-duty truck-mounted cranes
2. Key Technical Specifications (OEM Standard)
| Parameter | Specification |
|---|---|
| Rated Output Torque | 700 N·m |
| Rated Input Speed | 2600 rpm |
| Gear Ratio | 0.72 (corrected from image label; previously noted as 1.0) |
| Control Method | Bi-directional pneumatic (requires ≥0.6 MPa air pressure), with neutral lock, supports stationary PTO operation |
| Gear Parameters | 24:35 teeth (OEM standard), spur gear drive |
| Output Flange | φ120 mm, 4×M12 bolt pattern, compatible with hydraulic pump connections |
| Weight | Approx. 32 kg |
| Materials | Housing: cast steel; Gears: 20CrMnTi (carburized and quenched) |
| Sealing | Fluorine rubber oil seals, resistant to gear oil / hydraulic oil |
3. Structure & Working Principle
Mounting Position: Secured to the transmission's bottom PTO port with 8×M10 bolts, using a gasket + sealant to prevent leaks.
Power Flow: Transmission countershaft drive gear → PTO input gear → PTO output shaft → Hydraulic pump (PTO-driven).
Pneumatic Control: Solenoid valve energized → Air cylinder pushes the shift fork → Gears engage; Solenoid valve de-energized → Spring returns → Gears disengage. Features interlock (requires clutch depressed, transmission in neutral / low gear).
4. Installation & Operating Guidelines
Pre-Installation: Clean the mating surface, replace the OEM gasket (apply a thin layer of sealant), and torque bolts diagonally to 45–50 N·m.
Oil Level Check: No separate oil fill required (shares the transmission's gear oil); oil level should reach the midpoint of the sight glass.
Operation: Ensure air pressure ≥0.6 MPa, depress the clutch, shift to neutral, activate the PTO switch, then slowly release the clutch. Do not force engagement under load.
Maintenance Schedule: Initial oil change at 50 hours; subsequent inspections of oil level / seals every 500 hours; gear wear inspection annually.
5. OEM vs. Aftermarket Units
| Feature | OEM (Fast) QD70 (G9910) | Aftermarket (QD60 Modified) |
|---|---|---|
| Part Marking | G9910 drawing number, laser-etched codes | Generic QD60 markings (often G20721) |
| Gear Material | 20CrMnTi (carburized steel) | Standard alloy steel |
| Rated Torque | 700 N·m | 500–600 N·m |
| Warranty | 12 months | Typically 3–6 months |
| Price Premium | 30% higher | Lower cost |
6. Common Troubleshooting
| Symptom | Possible Causes | Troubleshooting |
|---|---|---|
| Difficult engagement / gear clashing | Low air pressure, incomplete clutch disengagement, worn gears | Check air pressure / clutch free play; inspect and replace gears |
| Oil leaks | Damaged gasket, worn oil seals, loose bolts | Replace gasket / seals; retorque bolts diagonally |
| Low power output | Worn gears, incorrect gear ratio | Inspect gear tooth surfaces; verify transmission model compatibility |
7. Ordering Information
Assembly Model: QD70 (G9910)
Part Number: G9910 (Fast OEM)
Compatible Transmissions: 9JS119TA, 9JS150A, RT-11509C
Price Range: OEM units (approx. USD $680–800), 12-month warranty
