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AP2D36 is a tandem variable piston pump for open-circuit mobile hydraulics. Two pump sections share one shaft, so one unit can supply more than one machine function at the same time.
The split layout is the real advantage. One section can serve travel, the other can support work functions, and auxiliary pump options are available for pilot or additional circuit supply. In practice, it works as a compact main-pump package rather than a one-pump, one-job setup.
It is also the higher-pressure size in that range. AP2D36 is listed at 31.4 MPa, while sizes 12, 18, and 25 are shown at 24.5 MPa. The pump uses variable displacement, and LV constant power control with power shift is one of the listed control options.
Key Features & Benefits
Tandem double-pump structure lets one housing supply two main hydraulic sections from one drive input.
Variable displacement swashplate design gives better flow matching than a simple fixed-output pump.
AP2D36 carries the highest pressure rating in the AP2D sheet at 31.4 MPa nominal.
Size 36 delivers up to 2 × 81.4 L/min, so it suits compact machines that still need real combined flow.
Optional third-pump arrangements make it easier to support pilot or extra hydraulic functions in one package.
LV constant-power control with power shift is available in the family for machines that need better input-power management.
The family calls for minimum oil cleanliness of ISO 4406 20/18/15, which is a good reminder that clean oil matters on this pump.
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Technical Specifications
|
Model |
Series |
Displacement (cc/rev) |
Nominal Pressure |
Max Speed (rpm) |
Max Flow (L/min) |
Max Power (kW) |
Max Torque (Nm) |
Approx. Weight (kg) |
|
AP2D12 |
30 |
2 × 12 |
24.5 MPa / 245 bar |
2800 |
2 × 33.6 |
16 |
61.9 |
14 |
|
AP2D18 |
30 |
2 × 18 |
24.5 MPa / 245 bar |
2600 |
2 × 46.8 |
19 |
75.5 |
19 |
|
AP2D25 |
20 |
2 × 25 |
24.5 MPa / 245 bar |
2600 |
2 × 65.0 |
36 |
154.9 |
27 |
|
AP2D36 |
30 |
2 × 37 |
31.4 MPa / 314 bar |
2200 |
2 × 81.4 |
37 |
160.6 |
45 |
The AP2D family table shows sizes 12, 18, 25, and 36, with AP2D36 carrying the largest displacement, highest pressure, and highest listed flow in that sheet. All values above are theoretical table values from the series data.
Auxiliary Pump Options Often Seen with AP2D36
|
Auxiliary Type |
Available On |
Displacement Options (cc/rev) |
Nominal Pressure |
|
GSP2 built-in gear pump |
All AP2D |
4.5 / 6.5 / 8.6 / 12 / 16 / 22 |
25 MPa for sizes 04–16, 17 MPa for size 22 |
|
G1 gear pump |
Size 36 |
6.5 / 8.9 / 10.7 |
4.9 MPa |
|
Trochoid pump |
Sizes 12 / 18 / 25 |
5.1 / 6.5 |
3.9 MPa |
For AP2D36 specifically, the family sheet shows G1 gear pump options for size 36, plus GSP2 arrangements that can also be combined on the larger frame. The installation-end layout changes with these added functions, so the final drawing should always be confirmed before order.
Hydraulic-fluid guidance in the same sheet gives an optimum operating viscosity of 16–36 mm²/s, a minimum cleanliness level of ISO 4406 20/18/15, and a normal system temperature limit where the fluid in the system should not exceed 90°C.
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How It Works
The shaft drives both pump sections together
AP2D36 is a double pump, so one input shaft turns two piston pump sections at the same time. Inside each section, the cylinder block rotates and the pistons run against the swashplate. That piston movement creates suction on the inlet side and pressure flow on the outlet side. Same basic axial piston logic. Just doubled into one housing.
Oil flow is split into two working sections instead of one
Because the unit has two main pump elements on a common shaft, the machine can feed separate hydraulic functions at the same time. In compact excavator-type use, that usually means one pump package supporting travel and working equipment together, rather than relying on one smaller single-flow source. If an auxiliary pump is added, it can also support pilot or extra circuit demand.
The swashplate control trims output as pressure rises
On the listed LV constant-power with power-shift control, the delivery pressures act on a control piston linked to the swashplate, while a spring resists that movement. At lower pressure, the swashplate stays near maximum angle. As pressure rises and overcomes the spring force, the swashplate tilts back until force balance is reached. That is how the pump avoids just staying wide open all the time.
Model Range
|
Displacement |
Models |
Typical Application |
|
36 cm³/rev |
AP2D36 |
Compact hydraulic systems, mini and medium excavators |
|
Tandem Pump Version |
AP2D36 + AP2D36 |
Excavator main hydraulic circuits requiring combined flow output |
|
Series Pump Range |
AP2D36 |
Open-circuit hydraulic applications for construction machinery |
Applications & Industries
The cleanest way to describe AP2D36 is this: it is mainly a compact excavator / mini excavator main-pump platform, especially in the 6–8 ton class and nearby machine range. The six application directions below all sit inside that practical use area.
Compact Excavators
This is the most direct fit. AP2D36 is used as a main hydraulic pump on compact excavator platforms in the 6–8 ton range.
Short-Tail / Urban Excavators
Machine references tied to AP2D36 include short-radius excavator models, which makes it a practical fit for urban digging and confined jobsite work.
Utility Trenching Machines
Since the pump is built around compact excavator duty, it naturally fits machines used for pipe work, cable trenching, and smaller municipal digging jobs. This is an application inference from the compact-excavator platform described in the sources.
Landscaping & Groundwork Equipment
Another common fit direction for the same compact machine class. Same reason. Medium flow, compact layout, and tandem output in a small machine package. This is also an inference from the mini-excavator application described in the AP2D material.
Rebuild / Replacement Market for Excavators
AP2D36 shows up frequently in the replacement-pump market for compact excavators, which is why many buyers come with an old pump code rather than a fresh machine drawing.
Compact Construction Fleet Service
Rental and fleet repair shops working on smaller excavator platforms are also a normal buyer group for this pump style. That is an inference from the documented compact-excavator use and the broad replacement market around this model.
About Us
Sheungchak is an OEM hydraulic manufacturer focused on pumps, motors, valves, and related spare parts. We produce our own products and support customers from model confirmation through shipment.
Most buyers are really checking a few basic things.
Model right or not. Quality stable or not. Lead time clear or not.
That is how we handle AP2D36 orders too.
OEM production
Nameplate customization
Packing adjustment
Drawing or sample confirmation
Export shipment suppor
Years in business
20+ years
Main products
Axial piston pumps / hydraulic motors / valves / spare parts
Main markets
Europe / South America / Middle East / Southeast Asia / Africa
Main strengths
OEM production / technical support / stable lead time / export service
Certifications
Certificate name
Certificate name
Certificate name
Certificate name
Certificate name
Our Factory & Quipment
cooperative partner
We are looking for a cooperative partner to expand our business.
FAQ Display Content
1) Is AP2D36 a single pump or a tandem pump?
It's a double pump. Two piston sections share one common shaft, so one unit can support more than one hydraulic function at the same time.
2) What displacement does AP2D36 use?
The size-36 unit is listed at 2 × 37 cc/rev. So you are dealing with two main pumping sections, not one 37 cc section by itself.
3) What pressure can this pump handle?
For AP2D36, the listed nominal pressure is 31.4 MPa, which is about 314 bar. That pressure rating is higher than the 12, 18, and 25 sizes in the same family sheet.
4) What flow can I expect?
The table value for AP2D36 is 2 × 81.4 L/min at the listed maximum speed of 2200 rpm. Those are theoretical values from the family table, so real machine output still depends on condition and efficiency.
5) Can AP2D36 be supplied with a pilot or extra gear pump?
Yes. The AP2D family allows added auxiliary pump setups. On size 36, the sheet shows G1 gear pump options and also GSP2 arrangements.
6) What oil cleanliness should be kept?
Minimum cleanliness is ISO 4406 20/18/15. The optimum operating viscosity band shown for the family is 16–36 mm²/s. Cleaner oil usually means longer life on this kind of piston pump, which is not exactly shocking.
7) What should be done before first start-up?
The installation notes say the pump should be filled through the highest leakage-oil port before commissioning. That step is easy to skip when people are in a hurry. It is still worth doing.
8) What do you need before quoting the right AP2D36?
Best case, send the full old model code and clear photos. If the unit has added auxiliary pump functions, that matters too, because AP2D36 can be supplied as pump-only or with extra rear-end pump arrangements, and the final layout changes with those options.
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