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SANY Bosch Rexroth 9 Teeth Charge Pump Boost Pump A4VG180
In addition to the 9-tooth version, the A4VG180 through-drive interface is commonly available on the market in 11-tooth (11T) configurations and versions without through-drive capability (i.e., no tandem pump mounting); please be sure to verify that the old unit you are removing is indeed a 9-tooth model before making a purchase.
Considerations for Selection and Replacement
1. Rotation Direction (R or L): This must strictly match the rotation of the main pump. If the wrong direction is selected, the charge pump will fail to draw oil, causing the entire main pump to burn out instantly due to oil starvation.
2. Rear Flange Specifications: A 9-tooth spline typically pairs with an SAE A standard 2-bolt flange interface. Please verify whether the rear interface is intended for tandem mounting an auxiliary pump or simply for sealing with an end cover.
3. Oil Seal and Valve Plate Installation: When replacing the charge pump, it is strongly recommended to simultaneously replace the associated paper gaskets, O-rings, and side plates. Due to friction within the internal gear set, old side plates often exhibit wear; reusing them can easily lead to issues such as a failure to build up charge pressure or the pump truck failing to start.
Core System Functions
1. Compensating for internal leakage: During high-pressure operation, internal leakage occurs between the cylinder block and the valve plate, as well as between the pistons and their bores. The charge pump continuously supplies low-pressure oil to prevent system cavitation.
2. Maintaining low-side circuit pressure: Ensures stable pressure on the low-pressure side of the main pump's closed-loop circuit, protecting the main hydraulic motor and main pump during equipment driving and braking.
3. Supplying control oil: Provides the necessary pilot control pressure for the main pump's servo control valves, electro-proportional controls, and hydraulic swashplate angle adjustment mechanisms.
4. Circulating oil for cooling and heat dissipation: Directs excess hot, low-pressure oil back to the reservoir via a flushing valve and through a heat exchanger, while continuously introducing cool oil to significantly lower the operating temperature of the entire unit.
A4VG180 9T Charge Pump Replacement Complete BOM List
| No. | Component Name | Recommended Qty | Part Attribute / Status |
|---|---|---|---|
| Core Assembly | |||
| 1 | Integrated Gear Charge Pump Assembly (Boost Pump / Charge Pump) |
1 Set | Mandatory Replacement |
| Seals & Gaskets | |||
| 2 | Charge Pump Housing Gasket / Shims (Housing Paper Gasket) |
1 Pc | Mandatory Wear Item |
| 3 | Rear Interface Flange O-Ring (O-Ring for Rear Through-Drive) |
1 Pc | Mandatory Wear Item |
| 4 | Shaft Skeleton Oil Seal (Through-Drive Shaft Seal) |
1 Pc | Replace based on wear |
| Internal Wear Parts (Depending on Overhaul Condition) | |||
| 5 | Side Plates / Wear Plates (Thrust Plates / Wear Plates) |
1 Set (2 Pcs) | Highly Recommended |
| 6 | Spline Coupling Adapter (Internal Spline Sleeve) |
1 Pc | Replace based on wear |
| System Fluid & Filtration | |||
| 7 | Closed-Loop High-Pressure Charge Filter (Charge Pressure Filter Element) |
1-2 Pcs | Mandatory Replacement |
| 8 | Anti-Wear Hydraulic Oil (Fresh Hydraulic Oil) |
As Required | Replace if contaminated |
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