Beschreibung
MEZ504.55.016
MEZ504.55.016-3
This page covers two reference model numbers — MEZ504.55.016 and MEZ504.55.016-3 — that share the same core specification: 63 mm bore, 30 mm rod, 142 mm stroke, and 362 mm mounting distance. Both are tractor hydraulic lift cylinders supplied by Ever-Power for agricultural lift applications.
The “-3” suffix denotes a variant designation, which in aftermarket and OEM cylinder cataloging often indicates a sub-variant within the same product family — typically a difference in end connection detail, port location, surface treatment, or a revision to the original specification. Because the core dimensional specification is identical, both reference numbers are treated on a single page rather than creating two nearly duplicate product pages that would serve no additional purpose for buyers.
If you are sourcing based on one of these numbers, verify the end connection geometry and port specification of your existing cylinder — that is where variants in the same family most commonly differ.
Why MEZ504.55.016 and MEZ504.55.016-3 are on the same page
In hydraulic cylinder part numbering, a numeric suffix (such as “-3”) typically designates a production variant, revision level, or application-specific adaptation within a base configuration. When the underlying bore, rod, stroke, and mounting distance are identical, creating two separate product pages would mean two pages with 95% duplicate content and no additional value for a buyer comparing the two. Instead, this page covers both reference numbers, explains where they may differ, and directs buyers to verify the specific detail — end connection, port specification, or variant marking — that distinguishes them on their particular machine.
MEZ504.55.016 / MEZ504.55.016-3 — Technical Specifications
| Parameter | Value | Notes |
|---|---|---|
| Reference Models | MEZ504.55.016 / MEZ504.55.016-3 | Same core specification; verify variant-specific details against existing unit |
| Bore Diameter | 63 mm | Same bore class as NF63C, YC504D.55.501, TEQ300.59.001A, QY350.59.003 |
| Rod Diameter | 30 mm | Narrowest rod in the 63 mm bore group; smallest cross-section relative to bore |
| Stroke | 142 mm | Longest stroke in the 63 mm bore group; 29% more travel than NF63C (110 mm) |
| Mounting Distance | 362 mm | Longest mounting distance in the 63 mm group; pin-center to pin-center, retracted |
| Anwendung | Agricultural tractor hydraulic lift systems | Verify fitment by measuring existing cylinder |
| Supplier | Ever-Power | OEM and aftermarket supply; custom specifications on inquiry |
Where the MEZ504.55.016 Sits in the 63 mm Bore Family
The table below shows all five 63 mm bore cylinders in this product range. Reading across the row, every column matters for replacement compatibility. The MEZ504.55.016 stands apart from the group on two dimensions: it has the longest stroke (142 mm) and the longest mounting distance (362 mm), and simultaneously the narrowest rod (30 mm).
| Model | Bore | Rod | Stroke | Mounting Dist. |
|---|---|---|---|---|
| YC504D.55.501 | 63 mm | 35 mm | 100 mm | 300 mm |
| NF63C | 63 mm | 32 mm | 110 mm | 350 mm |
| TEQ300.59.001A | 63 mm | 35 mm | 120 mm | 300 mm |
| QY350.59.003 | 63 mm | 35 mm | 140 mm | 300 mm |
| MEZ504.55.016 / -3 | 63 mm | 30 mm | 142 mm | 362 mm |
Three things stand out from this comparison. First, the MEZ504.55.016 has the longest stroke — 142 mm, compared to the next-longest QY350.59.003 at 140 mm (a 2 mm difference), and 32 mm more than the NF63C. Second, its mounting distance — 362 mm — is 12 mm longer than the NF63C and 62 mm longer than the 300 mm group. Third, its 30 mm rod is the narrowest among all five, which has implications discussed below. None of the other four cylinders are substitutes for it in a machine designed around its specific geometry.
142 mm Stroke: What the Extra Travel Means in Practice
A 142 mm stroke gives the piston rod 29% more linear travel than the NF63C’s 110 mm, and 42% more than the YC504D.55.501’s 100 mm. In a tractor hydraulic lift application, that additional travel translates directly into a wider range of implement position — the difference between the lowest and highest position of the lift arms is proportional to the cylinder stroke and the geometric ratio of the linkage.
Whether that additional travel is useful depends entirely on what the machine was designed to do. A tractor with a lift linkage designed around 142 mm of cylinder travel needs that full stroke to achieve its rated maximum lift height. Fitting a shorter-stroke cylinder — say, 110 mm — would reduce the maximum lift height the system can reach, even if the replacement cylinder generates the same force. The implement would not rise as high.
Conversely, fitting a 142 mm stroke cylinder into a machine designed for 110 mm would push the lift arm 32 mm past its designed endpoint — potentially past a mechanical travel stop, into a position where the linkage geometry becomes unfavorable, or where the cylinder body contacts the machine frame.
Practical note for replacement sourcing: If your existing cylinder has a 142 mm stroke and 362 mm mounting distance, neither of the other 63 mm bore cylinders in this range is a direct substitute. The dimensional differences — particularly in mounting distance — mean that the bracket geometry on your machine will not align with a shorter or differently-mounted replacement. Measure both stroke and mounting distance before concluding that any 63 mm bore cylinder will fit.
The 30 mm Rod: Load Considerations at Extended Position
At 30 mm, the MEZ504.55.016 has the narrowest rod among the five 63 mm bore cylinders in this group — 5 mm less than the NF63C (32 mm) and 5 mm less than the YC504D.55.501 (35 mm). The significance of this depends on the application.
Rod diameter affects two things: compression stiffness (resistance to buckling when the rod is extended under axial compressive load) and side-load resistance (resistance to bending from lateral forces). For a cylinder with a 142 mm stroke, the rod is extended further than on shorter-stroke models, which increases the unsupported rod length and therefore the effective buckling risk under high compressive loads.
In a well-aligned tractor lift installation where the cylinder operates primarily in compression along its axis — which is the normal condition — a 30 mm rod at 142 mm stroke is a design choice made by the original machine manufacturer. It does not indicate a deficiency. What it does mean for replacement sourcing is that the rod-end connection on your machine — pin diameter, clevis or eye dimensions — will be sized for a 30 mm rod. A replacement with a 32 mm or 35 mm rod will have a larger end fitting that will not match the original bracket without modification.
When the rod shows signs of bending or scoring in service, investigate the cause before replacing the cylinder. A bent rod in a lift cylinder that operates in pure compression usually indicates side loading — either from misalignment in the mounting, from the linkage geometry operating outside its designed range, or from impact damage. A new cylinder in the same installation with the same misalignment will develop the same problem.
63 mm Bore: Force Reference
The 63 mm bore gives a piston face area of approximately 3,117 mm² (π × 31.5²). At a reference pressure of 160 bar, theoretical extension force is in the order of 49.9 kN. This is the same force potential as the other 63 mm bore cylinders in this group — bore is the common denominator, and it does not change based on stroke or rod selection.
Engineering Reference Note: Force figures are theoretical calculations based on bore geometry and reference pressure only. They are not rated product specifications. Actual force output depends on the hydraulic system’s operating pressure, valve restrictions, and line losses. No rated pressure for the MEZ504.55.016 has been confirmed by Ever-Power for publication here.
And — as with every cylinder in this product family — theoretical cylinder force is not the same as tractor rated lifting capacity. Hitch lifting capacity depends on lift arm geometry, mechanical advantage ratio, cylinder mounting angle relative to the pivot, and whole-machine design parameters that go well beyond the cylinder’s bore and the system’s operating pressure. Brochure-rated lift capacity figures come from standardized machine-level testing, not from bore-area calculations.
MEZ504.55.016 vs MEZ504.55.016-3: Identifying the Right Variant
In hydraulic cylinder part numbering, suffixes — whether numeric like “-3” or alphabetic — typically indicate a variant or revision within a base model family. Common reasons for variant suffixes include differences in the mounting end connection (clevis vs eye, different pin diameter), port location or thread type, surface treatment, minor dimensional revision to fit a specific machine configuration, or an updated seal specification from a production revision.
Without confirmed documentation specifying what the “-3” suffix designates in this particular part number system, the safest approach for a replacement buyer is to verify the physical details of the existing cylinder that go beyond bore, rod, stroke, and mounting distance — specifically:
- End connection type at both ends (clevis, eye, trunnion, or other)
- Pin diameter at each end
- Clevis width or eye width
- Port thread type, size, and location
- Whether the cylinder has one or two ports
- Any visible markings, casting codes, or stamped identifiers on the cylinder body
If you are ordering based on the reference number MEZ504.55.016-3 specifically, note the suffix when submitting the inquiry so the correct variant can be confirmed. If you are replacing an unlabeled cylinder and matching purely on dimensions, provide the full measurement set — the variant distinction will be resolved through the end connection details.
Measuring for Replacement: MEZ504.55.016 Configuration
This cylinder has the longest stroke and the longest mounting distance among the 63 mm bore group. Both dimensions are specific enough that there is no close substitute within this product family — finding a replacement requires matching all key dimensions, not just bore.
| Measurement | Target Value | How to Measure |
|---|---|---|
| Bore | 63 mm | Inside barrel diameter; or outer barrel diameter minus wall thickness × 2 |
| Rod Diameter | 30 mm | Calipers on clean, undamaged rod surface |
| Stroke | 142 mm | Extended pin-center distance minus retracted pin-center distance |
| Mounting Distance | 362 mm | Pin-center to pin-center, cylinder fully retracted |
| Extended Length | 504 mm (362 + 142) | Pin-center to pin-center, cylinder fully extended; verify available clearance on machine |
| Rod-end pin diameter | To be measured | Calipers on existing pin or pin bore |
| Base-end pin diameter | To be measured | May differ from rod-end; measure separately |
| Mounting end type | To be confirmed | Identify clevis, eye, trunnion, or other; note variant suffix if labeled |
| Port specification | To be confirmed | Thread type (NPT/BSP/metric), size, number of ports, location on body |
Extended length note: At 362 mm mounting distance plus 142 mm stroke, the pin-center to pin-center distance at full extension is 504 mm. Before fitting a replacement, confirm that 504 mm of pin-to-pin clearance is available in the machine’s fully raised position — if the linkage contacts a mechanical stop before the cylinder reaches full extension, the cylinder may be operating in an over-constrained position.
Troubleshooting the Hydraulic Lift System
The symptoms below apply to the hydraulic lift system as a whole. Attributing them to the cylinder before isolating the circuit is a common and expensive mistake.
Load drift with controls in neutral
Could be internal cylinder bypass, control valve leakage, or check valve failure. Isolate the cylinder by disconnecting hoses and capping its ports. If drift stops, the leak is external to the cylinder. If drift continues, the cylinder’s internal seals are a more likely source. Slow, consistent drift regardless of load weight often points to the control valve rather than the cylinder.
Rod scoring or surface damage
A scored rod accelerates seal wear. On a long-stroke cylinder like the MEZ504.55.016, more rod is exposed at full extension, increasing surface area subject to contamination and potential damage. Check that the rod wiper seal is intact — its job is to exclude field debris from entering along the rod as it retracts.
Cylinder does not reach full extension
If the lift arm stops before reaching maximum height, check whether the cylinder is reaching its internal stop or whether the lift arm is hitting a mechanical limit. Also check hydraulic fluid level and pump output — insufficient flow or pressure will prevent full extension under load even with an otherwise intact cylinder.
Jerky or uneven movement
Air in the hydraulic circuit is a common cause of erratic cylinder motion — particularly after seal replacement or any work that opened the hydraulic lines. Bleed the circuit according to the machine’s service procedure. Low oil level, a clogged filter, or a sticking control valve spool can produce similar symptoms.
What to Include in a Quotation Request
For MEZ504.55.016 or MEZ504.55.016-3 sourcing, note the suffix in your inquiry — it helps identify whether the base model or the variant is required. If both appear in your machine’s parts documentation, mention that as well.
- Reference number: MEZ504.55.016 or MEZ504.55.016-3 (specify which applies)
- Order quantity
- Tractor or machine model and year, if known
- Confirmed bore (63 mm), rod (30 mm), stroke (142 mm), mounting distance (362 mm) from measurement
- Pin diameters at rod end and base end
- Mounting end type at both ends
- Port thread type, size, and number of ports
- Single-acting or double-acting (from port count)
- Any visible variant markings on the existing cylinder body
- Photos: side view of full cylinder, both mounting ends, port detail, any damage or markings
- Working pressure if known from machine documentation
Häufig gestellte Fragen
Why are MEZ504.55.016 and MEZ504.55.016-3 on the same page?
Both reference numbers share the same core specification: 63 mm bore, 30 mm rod, 142 mm stroke, and 362 mm mounting distance. In aftermarket hydraulic cylinder cataloging, a numeric suffix like “-3” typically indicates a production variant or revision within the same base configuration — often a difference in end connection detail, port specification, or surface finish. Creating two nearly identical product pages for the same physical cylinder adds no value for a buyer. This page covers both references together and directs buyers to verify the variant-specific details — end connection type, pin diameter, port thread — that distinguish them on their machine.
What does the “-3” suffix mean on a hydraulic cylinder part number?
Part number suffixes in hydraulic cylinder cataloging are manufacturer-specific — there is no universal standard. Common uses include: a revision level (the third design iteration of a base model), a variant designation (a specific mounting end or port configuration within the family), or an application code (a derivative produced for a particular machine or customer). Without confirmed documentation for this specific part number system, the safest approach is to note the suffix in any inquiry and verify the end connection and port details against the existing unit, rather than assuming the base number and the suffixed version are fully interchangeable.
Can I replace the MEZ504.55.016 with a QY350.59.003 (140 mm stroke)?
No, not as a direct replacement. The QY350.59.003 has a 300 mm mounting distance versus the MEZ504.55.016’s 362 mm — a difference of 62 mm in pin-center spacing that the machine’s bracket geometry cannot accommodate without modification. The rod diameter also differs: 35 mm on the QY350 versus 30 mm on the MEZ504. While the 2 mm stroke difference (142 mm vs 140 mm) is relatively minor, the mounting distance and rod diameter differences make them non-interchangeable for a direct bolt-in replacement.
Does the narrower 30 mm rod reduce lifting force?
No. Extension force is determined by bore area and pressure — the rod diameter has no effect on extension force. The 30 mm rod reduces the effective area on the rod side of the piston, which means retraction force is slightly higher (more piston area available) than on a cylinder with a larger rod — not lower. Rod diameter affects stiffness, buckling resistance, and end connection dimensions. It does not change how hard the cylinder pushes during extension.
How do I confirm which variant I need — MEZ504.55.016 or MEZ504.55.016-3?
Check the existing cylinder for any stamped or labeled part number on the body or end caps. If a number is visible, include it in your inquiry. If the cylinder is unlabeled or the marking is illegible, provide the full dimensional measurement set — bore, rod, stroke, mounting distance, pin diameters, end connection type, and port specification — along with photographs of both ends. From those details, the correct variant can be identified or a compatible replacement can be confirmed.
My tractor implement slowly lowers on its own. Is this the cylinder?
Not necessarily. Load drift can originate in the cylinder’s piston seal, but it is equally common for it to come from internal bypass in the control valve or a leaking check valve in the circuit. To isolate the cylinder: disconnect the hydraulic hoses and cap the cylinder’s ports. If the drift stops with ports capped, the cylinder is holding and the leak is external to it. If drift continues with ports capped, the cylinder’s internal seals are the more likely source. This test takes a few minutes and avoids the cost of replacing the cylinder when the actual fault is elsewhere in the circuit.
