Description
The YC504D.55.501 is a 63 mm bore tractor hydraulic lift cylinder with a 35 mm rod, 100 mm stroke, and 300 mm mounting distance. Among the 63 mm bore cylinders in this family, it has the shortest stroke and the most compact mounting geometry — both of which matter when the machine’s installation space or linkage travel range is constrained.
The 100 mm stroke is 10 mm shorter than the NF63C (110 mm) and 42 mm shorter than the MEZ504.55.016 (142 mm). The 300 mm mounting distance is notably more compact than the NF63C’s 350 mm. These are not minor differences — they determine whether this cylinder is physically compatible with a given machine, and they affect the range of implement movement the lift system can achieve.
Ever-Power supplies the YC504D.55.501 as an aftermarket replacement cylinder for tractor hydraulic lift applications. Confirm dimensions against the existing cylinder before ordering.
YC504D.55.501 — Technical Specifications
| Parameter | Value | Notes |
|---|---|---|
| Bore Diameter | 63 mm | Same bore class as NF63C and MEZ504.55.016 |
| Rod Diameter | 35 mm | Larger than the NF63C’s 32 mm rod; affects rod stiffness and end connection dimensions |
| Stroke | 100 mm | Shortest stroke in the 63 mm bore group; sets available linkage travel |
| Mounting Distance | 300 mm | Most compact mounting geometry in the 63 mm group; pin-center to pin-center retracted |
| Application | Agricultural tractor hydraulic lift systems | Verify fitment by measuring existing cylinder |
| Supplier | Ever-Power | OEM and aftermarket supply; custom specifications on inquiry |
How the YC504D.55.501 Sits Within the 63 mm Bore Group
Several cylinders in the Ever-Power range share the same 63 mm bore. The bore determines how much force the cylinder generates at a given pressure. What distinguishes them from each other — and what determines whether one can replace another — is the stroke, mounting distance, and rod diameter.
| 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 | 63 mm | 30 mm | 142 mm | 362 mm |
Key takeaway: All five cylinders above share a 63 mm bore and will generate similar theoretical hydraulic force at the same pressure. None of them are directly interchangeable with each other — stroke, mounting distance, and rod diameter all differ across the group. Matching the correct model requires verifying all three dimensions against the existing installation, not just the bore.
63 mm Bore: Piston Area and Theoretical Force
At 63 mm bore, the piston face area is approximately 3,117 mm² (π × 31.5²). This is the area over which hydraulic pressure acts to generate extension force. The relationship is direct: at 160 bar reference pressure, the theoretical extension force is in the order of 49.9 kN. At 180 bar, that rises to approximately 56.1 kN.
Engineering Reference Note: Force values above are theoretical calculations based on bore geometry and reference pressure only — not rated product specifications. Actual system output depends on your hydraulic circuit’s working pressure, valve restrictions, line losses, and mechanical efficiency. No rated pressure for the YC504D.55.501 has been confirmed by Ever-Power for publication here.
Because the YC504D.55.501 shares its 63 mm bore with the NF63C and other models in this group, the force potential at equivalent pressure is essentially the same across all of them. The distinguishing factors are geometry: stroke, mounting distance, and rod diameter — which is exactly what determines physical fitment and application suitability.
Rod Diameter: 35 mm vs 32 mm — What the Difference Means
The YC504D.55.501 uses a 35 mm rod, compared to the 32 mm rod on the NF63C. The difference of 3 mm in diameter translates to a meaningful increase in cross-sectional area — a 35 mm rod has approximately 19% more cross-sectional area than a 32 mm rod. That directly affects two things.
First, stiffness under compression. A thicker rod resists buckling more effectively when the cylinder is fully extended and subjected to axial compressive loads. For a 100 mm stroke cylinder, the extended rod length is relatively short, so buckling risk is low regardless — but the heavier rod still contributes to robustness under side loading, which can occur in lift linkages that are not perfectly aligned.
Second, the rod-end connection dimensions change. A 35 mm rod will have a larger clevis or eye than a 32 mm rod. If you are replacing an NF63C with a YC504D.55.501 (or vice versa), confirm that the rod-end pin diameter and bracket geometry are compatible — they may not be, even if the bore and stroke happen to match your machine.
The rod diameter also reduces the effective area on the rod side of the piston. For a double-acting cylinder, this means retraction force is lower than extension force — a standard characteristic of hydraulic cylinder design, not a defect.
Why 100 mm Stroke Matters — and When It Does Not
Stroke is the total travel distance of the piston rod from full retraction to full extension. On the YC504D.55.501, that is 100 mm. This is the shortest stroke in the 63 mm bore group, and the question most buyers face is straightforward: is 100 mm of travel enough for the application?
For tractor lift systems, stroke determines the range of movement available to the lift linkage. A tractor designed around a 100 mm stroke cylinder has its lift arm geometry, its implement position at full retraction (lowered), and its implement height at full extension (raised) all calculated around that 100 mm of travel. Fitting a cylinder with 20 mm of additional stroke into that system will push the linkage 20 mm past its designed endpoint — which may exceed the mechanical travel limits of the lift arm, over-extend the linkage, or result in the cylinder contacting its internal stop before the lift arm reaches its designed position.
Stroke and force are independent:
A 100 mm stroke cylinder and a 142 mm stroke cylinder with the same 63 mm bore generate the same theoretical force at the same pressure. Shorter stroke does not mean less lifting force. It means less available travel — nothing more, nothing less. Selecting a replacement cylinder with a longer stroke than the original does not improve lifting capacity; it changes the geometry of the lift system in ways the machine was not designed for.
When a machine was designed specifically for a 100 mm stroke cylinder in a compact installation — one where the mounting brackets are close together and the linkage travel range is limited — fitting a longer-stroke replacement is not a straightforward swap. The 100 mm stroke of the YC504D.55.501 is a specification, not a limitation.
Mounting Distance: 300 mm and What It Controls
The 300 mm mounting distance is the pin-center to pin-center measurement when the cylinder is fully retracted. This is the dimension that determines whether the cylinder physically fits between the machine’s two mounting pivot points. At full extension, the distance between pins will be 300 mm + 100 mm stroke = 400 mm. Both the retracted and extended positions need to be within the mechanical range of the machine’s linkage.
At 300 mm, the YC504D.55.501 is the most compact installation geometry among the 63 mm bore cylinders in this range. For comparison, the NF63C sits at 350 mm — 50 mm longer in the retracted position, and therefore 50 mm longer in the extended position as well. A machine built around a 300 mm mounting cylinder cannot simply accept a 350 mm mounting cylinder without modification to the bracket positions or linkage arms.
Interestingly, two other cylinders in this group — TEQ300.59.001A (120 mm stroke) and QY350.59.003 (140 mm stroke) — also share the 300 mm mounting distance. All three have the same 63 mm bore and 35 mm rod. The only difference between those three is stroke. If you are sourcing a replacement and your existing cylinder has a 300 mm mounting distance and 63 mm bore but you are uncertain of the stroke, measuring the stroke precisely is essential to identify which of the three is the correct match.
Hydraulic Cylinder Force Is Not Tractor Lifting Capacity
This point applies to every cylinder on this page and deserves a direct statement. The theoretical force a hydraulic cylinder generates — calculated from bore area and pressure — is the force at the rod tip along the cylinder axis. What a tractor actually lifts at its hitch points is governed by a separate set of mechanical factors: lift arm length, the ratio of the linkage, the angle at which the cylinder pushes on the arm, and where the cylinder is mounted relative to the arm pivot.
Tractor manufacturers publish rated lift capacity figures based on whole-machine testing to defined standards — typically at a specified distance behind the hitch points. That figure is not derivable from cylinder bore and pressure alone. Knowing that the YC504D.55.501 has a 63 mm bore does not tell you how much the tractor will lift. It tells you the force the cylinder contributes to the system under a given hydraulic pressure.
This matters practically when someone considers upgrading to a larger bore cylinder hoping to increase hitch capacity. The cylinder is one variable in a multi-variable mechanical system. Increasing bore without redesigning the linkage, adjusting hydraulic system flow, and verifying the structural capacity of the lift arms and mounting points will not reliably increase usable lift capacity — and may create problems in the hydraulic circuit if the pump cannot deliver adequate flow to the larger bore at the same operating speed.
Measuring for Replacement: What to Verify
The YC504D.55.501 is a specific configuration. Three other cylinders in this range share the same 63 mm bore and 35 mm rod and 300 mm mounting distance — the only way to confirm you have the right one is to measure the stroke of your existing cylinder.
Measurement checklist for YC504D.55.501 replacement verification:
- Bore: confirm 63 mm (measure barrel inner diameter or calculate from outer diameter minus wall thickness)
- Rod diameter: confirm 35 mm (measure with calipers on clean rod surface)
- Stroke: confirm 100 mm (extended pin-center distance minus retracted pin-center distance)
- Mounting distance: confirm 300 mm (pin-center to pin-center, fully retracted)
- Rod-end pin diameter (calipers)
- Base-end pin diameter (calipers — may differ from rod end)
- Mounting end type at both ends: clevis, eye, trunnion, or other
- Hydraulic port thread: NPT, BSP, or metric; confirm size and location
- Number of ports: one port (single-acting) or two ports (double-acting)
- Available clearance around the cylinder body in the installed position
If the existing cylinder is seized or badly damaged and cannot be measured directly, document what you can — port location, end types, any visible markings — and photograph both ends and the body. The machine’s original service manual, if available, is the most reliable source for confirming the original cylinder specification.
When to Inspect the Hydraulic Lift Cylinder
The cylinder is one component in the hydraulic circuit. Several common symptoms point to a circuit-level problem rather than a failed cylinder, and replacing the cylinder without isolating the fault first is an expensive way to not solve the problem.
Implement drifts down slowly in neutral
Could be internal cylinder bypass (piston seal), control valve internal leakage, or check valve failure. Isolate by capping the cylinder ports — if drift stops, the leak source is in the external circuit. If drift continues with ports capped, the cylinder’s piston seal is a more likely suspect. Do not assume the cylinder is at fault before running this test.
Oil leaking at the rod seal
Look at the rod surface as well as the seal. A scored or pitted rod will damage new seals quickly — if the rod surface is damaged, the cylinder body itself needs attention, not just the seal. A thin oil film on the rod after operation can be normal on some older designs; a visible drip or accumulation is not.
Cylinder reaches full extension before lift arm completes travel
On a correctly matched replacement, the cylinder and the linkage should reach their travel limits at the same time. If the cylinder hits its internal stop before the lift arm reaches full height, the stroke of the replacement may be too short for the machine — or the mounting geometry has shifted. Verify mounting distance and stroke against the original specification.
Weak or slow lifting at normal load
Check hydraulic fluid level and condition first. Contaminated or aerated fluid causes power loss throughout the circuit. A clogged hydraulic filter reduces flow. A failing pump reduces pressure. Internal cylinder bypass is only one of several possible causes — and typically shows itself as drift rather than as a straightforward loss of lift force.
Requesting a Quotation for YC504D.55.501
To get an accurate quotation — whether for a single replacement unit or a bulk procurement — the following information is most useful. Partial information is workable; complete information avoids back-and-forth and speeds up the process.
- Reference number: YC504D.55.501
- Order quantity
- Tractor or machine model and year, if known
- Confirmed bore, rod diameter, stroke, and mounting distance from measurement
- Pin diameters at both ends
- Mounting end type (clevis, eye, or other) at both ends
- Port thread type, size, and location
- Single-acting or double-acting (confirm from number of ports)
- Working pressure if known from machine documentation
- Photos of the existing cylinder: side view, both ends, ports, any damage visible
- Any special requirements (stroke modification, surface treatment, seal type)
For replacement inquiries where the original part number is unknown, measured dimensions and photographs of the existing unit are a workable basis for cross-referencing. If a dimensioned drawing is available from the original machine documentation, include it — it removes uncertainty about end connection geometry and port specification.
Frequently Asked Questions — YC504D.55.501
How is the YC504D.55.501 different from the NF63C?
Three dimensions differ. The YC504D.55.501 has a 35 mm rod (vs 32 mm on the NF63C), a 100 mm stroke (vs 110 mm), and a 300 mm mounting distance (vs 350 mm). Both share the same 63 mm bore. Because of these differences, they are not interchangeable. A machine built for the NF63C has bracket spacing and linkage geometry calibrated to a 350 mm mounting distance and 110 mm stroke — neither of which matches the YC504D.55.501. Always verify all dimensions, not just the bore.
Could I use a 120 mm or 140 mm stroke cylinder instead of the 100 mm?
Not as a direct replacement without modification. A 120 mm stroke cylinder in a system designed for 100 mm will extend 20 mm past the designed end position. Depending on the machine, this may mean the lift arm contacts a mechanical stop before the cylinder reaches full extension, the linkage is forced into an over-travel position, or the cylinder body is too long to install with the correct mounting distance. If the existing cylinder has a 100 mm stroke, the replacement should match it.
Why does the 300 mm mounting distance matter if the stroke matches?
Stroke and mounting distance are independent dimensions. Even if stroke is correct, a cylinder with the wrong mounting distance will have its pin centers misaligned with the machine’s bracket pivot points. In the retracted position, the rod-end pin will either not reach its bracket (too short) or push the linkage past its designed minimum position (too long). Both mounting distance and stroke need to match the original specification.
Does a shorter stroke mean less lifting force?
No. Stroke has no effect on the force a cylinder generates. Force is determined by bore area and pressure: F = P × A. A 63 mm bore cylinder at 160 bar generates the same theoretical extension force regardless of whether its stroke is 100 mm or 200 mm. Stroke only determines how far the rod travels — the range of movement available to the linkage. It does not affect the force at any point in that travel.
Is the 35 mm rod on the YC504D.55.501 better than the 32 mm rod on the NF63C?
It is larger, but whether that is “better” depends on the machine. A 35 mm rod has greater cross-sectional area, which improves compression stiffness and side-load resistance slightly. For a 100 mm stroke in a well-aligned installation, a 32 mm rod would be adequate by most hydraulic engineering standards. The important thing for replacement purposes is that the rod diameter must match the existing rod-end connection — the pin diameter, clevis width, and bracket geometry are all sized around the original rod. Fitting a 35 mm rod into a bracket designed for a 32 mm rod, or vice versa, will require modification.
What information do I need before requesting a quote?
At minimum: the model reference (YC504D.55.501), your confirmed bore, rod diameter, stroke, and mounting distance from direct measurement, pin diameters at both ends, mounting end type, port thread specification, and quantity. Photos of the existing cylinder from both ends and side view help confirm compatibility before quotation. If the cylinder has failed and cannot be measured fully, document what is accessible and include the machine model and year — partial information still allows an initial assessment.
