BITZER semi-hermetic compressors are widely used in commercial and industrial refrigeration systems. During compressor repair, refurbishment, and overhaul, the oil pump is a critical component of the lubrication system. Selecting the correct oil pump is essential for ensuring reliable compressor operation.
When purchasing BITZER compressor parts, repair shops, refrigeration contractors, and parts distributors often have the following questions:
Can the same oil pump be used in BITZER large 4-cylinder and 6-cylinder compressors?
Which BITZER compressor series use oil pump part number 362503-02?
What is the difference between part numbers 305125-03 and 362503-02?
Should you purchase the oil pump separately or as a complete bearing cover assembly with the oil pump?
This guide covers oil pump part numbers for selected BITZER four-cylinder and six-cylinder ECOLINE compressor series, explaining how to select the correct part, verify compatibility, and avoid common purchasing mistakes.
According to the parts information listed in the BITZER ECOLINE Service Guide, the following compressor series list oil pump part number 362503-02.
Compressor Series | Number of Cylinders | Oil Pump Part Number |
BITZER 4JE | 4 cylinders | 362503-02 |
BITZER 4HE | 4 cylinders | 362503-02 |
BITZER 4GE | 4 cylinders | 362503-02 |
BITZER 4FE | 4 cylinders | 362503-02 |
BITZER 6JE | 6 cylinders | 362503-02 |
BITZER 6HE | 6 cylinders | 362503-02 |
BITZER 6GE | 6 cylinders | 362503-02 |
BITZER 6FE | 6 cylinders | 362503-02 |
This information indicates that multiple four-cylinder and six-cylinder compressor series in the groups listed above use the same oil pump part number. However, the exact application should always be verified against the parts catalog for the specific compressor model and version.
Common series include: 4JE Series/ 4HE Series/ 4GE Series/ 4FE Series
Common series include: 6JE Series/ 6HE Series/ 6GE Series/ 6FE Series
Important: The series designation and number of cylinders are useful for preliminary identification, but they should not be used as the sole basis for determining parts interchangeability.
Part Number: 362503-02
Product Type: Oil pump assembly
The oil pump is an essential component of the lubrication system in BITZER semi-hermetic reciprocating compressors. Its primary function is to supply lubricating oil to the relevant internal compressor components, helping reduce friction and wear and supporting reliable compressor operation.
Part No. 362503-02 is listed for selected BITZER ECOLINE four-cylinder and six-cylinder compressor series, including 4JE, 4HE, 4GE, 4FE, 6JE, 6HE, 6GE, and 6FE.
When repairing or replacing an oil pump, confirm whether the customer needs the oil pump alone or a complete assembly that includes the bearing cover. This helps prevent discrepancies between the quoted product and the actual item supplied.
When purchasing BITZER oil pumps, pay close attention to these two part numbers. They refer to different product configurations and should not automatically be treated as interchangeable.
Part Number | English Name | Product Scope |
362503-02 | Oil Pump Assembly | Oil pump only |
305125-03 | Bearing Cover Complete with Oil Pump | Bearing cover and oil pump assembly |
If the existing bearing cover is still in good condition and can be reused, and only the oil pump needs to be replaced, check whether part number 362503-02 is compatible with the specific compressor model.
If inspection during compressor repair shows that both the bearing cover and the oil pump need to be replaced, verify whether part number 305125-03 is the correct assembly for the compressor model.
Important: Part number 305125-03 includes the bearing cover and oil pump. This does not mean it can directly replace the standalone oil pump in every compressor that uses part number 362503-02. Before ordering, confirm the exact compressor model, mounting configuration, and repair requirements.
For buyers sourcing replacement parts, oil pump compatibility cannot be determined solely by the number of cylinders, such as whether the compressor is a large four-cylinder or six-cylinder model. A more reliable approach is to verify the original part number and the corresponding compressor series.
According to the ECOLINE Service Guide, the following series pairs list the same oil pump part number:
4JE and 6JE
4HE and 6HE
4GE and 6GE
4FE and 6FE
All the series listed above specify oil pump part number 362503-02.
Before confirming compatibility, check the following:
The complete compressor model number, including all suffixes.
The original oil pump part number.
Whether the compressor belongs to the ECOLINE series or an older series.
Whether the customer needs the standalone oil pump or the complete bearing cover assembly with the oil pump.
Whether the parts catalog identifies any differences in design, mounting dimensions, or component versions.
Verifying these details before ordering can reduce purchasing errors and help avoid additional repair costs and shipping expenses caused by incompatible parts.
To speed up the quotation process and improve part identification, we recommend providing the following information.
Required Information | Details |
Compressor Brand | BITZER |
Complete Compressor Model | Full model number from the relevant 4JE, 4HE, 4GE, 4FE, 6JE, 6HE, 6GE, or 6FE series |
Original Part Number | 362503-02, 305125-03, or the part number marked on the original component |
Required Product Configuration | Standalone oil pump or bearing cover complete with oil pump |
Product Photos | Clear photos of the oil pump, bearing cover, and any identifying markings |
Serial Number | If available, to help verify the correct component version |
If the original part number is unavailable, you can provide the complete compressor model, serial number, and clear photos of the old component for further verification.
For refrigeration service companies, compressor rebuilding facilities, and refrigeration parts distributors, selecting the correct oil pump is an important step in compressor maintenance.
When sourcing replacement oil pumps, pay particular attention to the following factors.
Confirm that the oil pump is suitable for the target compressor and verify the corresponding original part number.
Check the mounting interfaces, overall dimensions, and relevant connection points to prevent installation problems caused by structural differences.
Evaluate machining accuracy, material quality, assembly quality, and product consistency to support reliable performance.
Clearly distinguish between a standalone oil pump and a complete bearing cover assembly with an oil pump. Misunderstanding the scope of supply can lead to ordering errors, quotation discrepancies, and unnecessary costs.
Selecting the correct replacement oil pump helps support efficient compressor repair, refurbishment, and overhaul operations.
Some ECOLINE four-cylinder and six-cylinder compressor series list the same oil pump part number, 362503-02. These include the 4JE, 4HE, 4GE, 4FE, 6JE, 6HE, 6GE, and 6FE series. The exact compressor model must still be verified before ordering.
According to the relevant ECOLINE service documentation, this part number is listed for applicable models in the 4JE, 4HE, 4GE, 4FE, 6JE, 6HE, 6GE, and 6FE series. Always consult the applicable parts catalog to confirm compatibility with the exact model and version.
Part number 362503-02 refers to the oil pump assembly, while 305125-03 refers to the bearing cover complete with an oil pump. The scope of supply differs, so the correct option should be selected according to the actual repair requirements.
The two part numbers should not be treated as equivalent. Part number 305125-03 includes the bearing cover, whereas 362503-02 refers to the oil pump assembly itself. Compatibility must be verified against the specific compressor model and mounting configuration.
No. Older compressor models may have different component specifications or design revisions. Always verify the original part number against the corresponding parts catalog before purchasing a replacement.
Selecting an oil pump for a BITZER large four-cylinder or six-cylinder semi-hermetic reciprocating compressor requires checking both the complete compressor model and the original part number.
For the relevant series listed in the ECOLINE service documentation, 362503-02 is an important oil pump part number to verify. Part number 305125-03, by comparison, refers to a bearing cover complete with an oil pump. The two products differ in structure and scope of supply.
If you are sourcing BITZER oil pumps for compressor repair, refurbishment, overhaul, or inventory replenishment, we recommend providing the complete compressor model, original part number, and product photos so compatibility can be confirmed before a quotation is issued.
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