Main hydraulic pressure dropping or slow cycle times on your E336D? A worn 322-8733 pump lets the rotating group bypass internally, starving every circuit. RITO rebuilds this main pump to OEM clearances so your machine's dig force and speed come back from the first hour.
Item NO.:
322-8733Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In Stock322-8733 Excavator Main Hydraulic Pump for E336D. Precision-machined barrel bores and lapped valve face restore volumetric efficiency, while the factory-calibrated regulator maintains stable pressure-flow output across the full working range.
| Part Number | 322-8733 |
|---|---|
| Part Name | Excavator Hydraulic Main Pump (Piston Pump) |
| Compatible Brand | E336D Main Pump |
| Applicable Models | E336D Excavator |
| Application | Main hydraulic pump for E336D excavator all-function operation |
| Material | High-strength alloy steel |
| Product Color | Metallic industrial finish |
| Working Temperature | -25°C~+60°C |
| Key Function | Generates main hydraulic flow and pressure for E336D work circuits |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
The 322-8733 cylinder block, pistons and shoes are machined to OEM clearance, restoring volumetric efficiency on the E336D.
Barrel face and valve plate are surface-matched to Ra 0.2, eliminating break-in leakage on the E336D main circuit.
The regulator is pre-set to the E336D engine power curve, preventing overload during combined boom, swing and travel demand.
322-8733 port configuration and flange are confirmed for the E336D, providing direct bolt-on installation.
FAQ
Q: What symptoms indicate the 322-8733 pump needs replacing on a E336D?
A: Main circuit pressure falls below specification, all functions slow simultaneously, case-drain flow exceeds the OEM limit, and oil temperature rises faster than normal.
Q: Does the 322-8733 pump include a matched valve plate?
A: Yes, this 322-8733 assembly includes a new matched valve plate and rotating group, so the sealing interface is correct from installation.
Q: What other models does the 322-8733 pump fit?
A: Cross-reference keywords 322-8733 / Caterpillar Main Pump / E336D Hydraulic Pump / Excavator Main Pump / Axial Piston Pump / Hydraulic Power Unit apply. Confirm your machine serial number with our team to verify compatibility with other models.
Q: How to confirm the 322-8733 is the correct pump for my E336D?
A: Match the pump model plate reading 322-8733 and confirm the machine is E336D. Provide pump and machine serial numbers to our team for exact confirmation.
Q: What quality options are available?
A: We provide original, OEM and high-quality aftermarket versions with stable supply capability.
Q:Why Choose RITO?
A:Listed Factory
Stable&Reliable Quality
OEM Factory for Chinese Top Excavator Brands
Supplier to Fortune 500 Companies
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