HPV145 pump leaking from the rear cover on your ZX330-3? A cracked or seal-damaged 1022441 pump rear cover allows case-drain oil to bypass the cover, contaminating the engine compartment and reducing pump case pressure that protects the rotating group from cavitation. RITO supplies this Handok-grade pump rear cover assembly to restore sealed, correct-pressure pump casing.
Item NO.:
1022441Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In Stock1022441 Pump Cover Assembly for Hitachi HPV145 piston pumps on ZX330-3, ZX330-5G, ZX350H-3, EX300-3 and ZX360-3G excavators. The rear cover seals the pump case-drain circuit and provides the structural backing for the rear shaft bearing. Alloy steel body and precision-machined seal grooves maintain the case pressure required to protect the HPV145 rotating group from cavitation at high shaft speed.
| Part Number | 1022441 |
|---|---|
| Part Name | Pump Cover Assembly (Rear) |
| Compatible Brand | Handok (Hitachi HPV145 Pump) |
| Applicable Models | ZX330-3, ZX330-5G, ZX350H-3, EX300-3, ZX360-3G Excavator |
| Application | Rear casing cover and bearing seat for Hitachi HPV145 main piston pump |
| Material | High-strength alloy steel casting |
| Product Color | Metallic grey |
| Working Temperature | -25°C~+80°C |
| Key Function | Seals the HPV145 pump case-drain circuit and supports the rear shaft bearing |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
Seal grooves machined to OEM O-ring and backup ring dimensions for correct seal squeeze, preventing case-drain oil leakage at the rear cover joint face.
Bearing seat bore machined to OEM tolerance for correct bearing pre-load, maintaining rear shaft concentricity and protecting the HPV145 rotating group from shaft deflection.
Correct cover sealing maintains the minimum case back-pressure needed to protect rotating group components from cavitation during high-speed HPV145 operation.
Manufactured to Handok material and dimensional specifications as reference, providing the structural integrity required for the high-pressure HPV145 pump application.
FAQ
Q: What causes the HPV145 rear pump cover to fail on ZX330-3?
A: Case-drain oil overheating from a partially blocked drain line causing pressure spikes, impact damage from external contact, or O-ring degradation from incompatible hydraulic oil additives are the main failure causes.
Q: Can I replace only the rear cover O-ring instead of the full 1022441 assembly?
A: If the cover body is undamaged and the seal groove is within OEM dimension, O-ring replacement alone can stop the leak. Replace the full 1022441 cover if the body has cracks, bearing seat fretting or groove damage that prevents O-ring sealing.
Q: What O-ring material is specified for the 1022441 cover on HPV145?
A: Use FKM (Viton) O-rings rated for hydraulic oil compatibility at 100 degrees C or above. Check the Hitachi ZX330-3 service manual for the specific O-ring size and material specification.
Q: How to confirm 1022441 fits my ZX330-3 HPV145 pump?
A: Match the existing cover part number 1022441 and confirm pump model is HPV145. Provide pump serial number to our team for cross-reference.
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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