Description
The TEQ300.59.001A is a 63 mm bore tractor hydraulic lift cylinder with a 35 mm rod, 120 mm stroke, and 300 mm mounting distance. It belongs to a subgroup of three cylinders within the 63 mm bore family that all share the same mounting geometry — 300 mm mounting distance, 63 mm bore, 35 mm rod — but have different strokes: 100 mm, 120 mm, and 140 mm.
That stroke difference is the entire selection question for anyone sourcing between these three. At 120 mm, the TEQ300.59.001A is the mid-stroke option in that group. It provides 20 mm more linear travel than the YC504D.55.501 and 20 mm less than the QY350.59.003. Whether those 20 mm matter in either direction depends entirely on what the machine was designed around.
Ever-Power supplies the TEQ300.59.001A as an aftermarket replacement for tractor hydraulic lift applications. Measure the stroke of your existing cylinder before ordering — it is the critical dimension that separates this model from its nearest alternatives.
TEQ300.59.001A — Technical Specifications
| Parameter | Value | Notes |
|---|---|---|
| Bore Diameter | 63 mm | Same bore as all 63 mm group cylinders in this range |
| Rod Diameter | 35 mm | Shared with YC504D.55.501 and QY350.59.003 in the 300 mm mounting subgroup |
| Stroke | 120 mm | Mid-stroke in the 300 mm mounting subgroup (100 / 120 / 140 mm) |
| Mounting Distance | 300 mm | Pin-center to pin-center, fully retracted; shared with YC504D.55.501 and QY350.59.003 |
| Application | Agricultural tractor hydraulic lift systems | Verify stroke of existing cylinder before ordering |
| Supplier | Ever-Power | OEM and aftermarket supply; custom specifications on inquiry |
The 300 mm Mounting Subgroup: Three Cylinders, One Difference
Within the 63 mm bore family, three cylinders share the exact same mounting distance, bore, and rod diameter. The only dimension that separates them is stroke. This matters because it creates a situation where a buyer who measures bore, rod, and mounting distance correctly — and finds all three match — still has not confirmed the right cylinder. Stroke is the remaining variable.
| Model | Bore | Rod | Stroke | Mtg. Dist. | Extended Length |
|---|---|---|---|---|---|
| YC504D.55.501 | 63 mm | 35 mm | 100 mm | 300 mm | 400 mm |
| TEQ300.59.001A | 63 mm | 35 mm | 120 mm | 300 mm | 420 mm |
| QY350.59.003 | 63 mm | 35 mm | 140 mm | 300 mm | 440 mm |
Practical consequence: All three cylinders will mount correctly on a machine with 300 mm pin-center bracket spacing. The cylinder bodies fit in the same installation space when retracted. The difference shows at the other end of the travel range: the TEQ300.59.001A will extend 20 mm less than the QY350.59.003 and 20 mm more than the YC504D.55.501. The lift arm and implement positions at full extension will differ accordingly. A machine designed for 120 mm of travel will not use the full stroke of a 140 mm cylinder — and depending on linkage geometry, forcing it to do so could take the lift arm past its designed mechanical limit.
Bore Diameter and Hydraulic Force
At 63 mm bore, the piston face area is approximately 3,117 mm² (π × 31.5²). Cylinder bore diameter determines piston area, and piston area directly determines how much force the hydraulic pressure generates. At a reference pressure of 160 bar, the theoretical extension force is in the order of 49.9 kN. At 180 bar, approximately 56.1 kN.
These numbers are the same across all three cylinders in the 300 mm mounting subgroup — because bore, and therefore piston area, is identical. Force does not change with stroke. The TEQ300.59.001A generates the same theoretical extension force as the YC504D.55.501 and the QY350.59.003 at any given pressure. The only thing that changes is how far the rod travels during that force application.
Engineering Reference Note: Force values above are theoretical calculations based on bore geometry and a reference pressure. They are not rated product specifications for the TEQ300.59.001A. Actual output depends on the system’s working pressure, valve restrictions, and circuit losses. No rated pressure for this model has been confirmed by Ever-Power for publication here.
What 120 mm Stroke Determines — and What It Does Not
Stroke defines one thing: the total linear travel available to the piston rod, from the fully retracted position to the fully extended position. On the TEQ300.59.001A, that travel is 120 mm. In a tractor lift system, that 120 mm of cylinder travel is converted — through the lift arm geometry and linkage ratio — into implement position change at the hitch points.
The conversion ratio between cylinder stroke and implement height change depends on the mechanical geometry of the specific machine. A tractor with a lift arm ratio of, say, 3:1 (where 1 mm of cylinder travel moves the implement 3 mm vertically at the hitch) would translate 120 mm of cylinder stroke into approximately 360 mm of implement vertical travel. The same ratio with a 140 mm cylinder would yield 420 mm. That 60 mm difference in implement height range is meaningful in field applications — it affects how much adjustment range the operator has between the lowest and highest implement positions.
This is why matching stroke to the original specification matters beyond just fitting the cylinder physically. Even when the mounting distance is correct and the cylinder installs without modification, using a shorter stroke than designed limits the maximum lift height the machine can achieve. Using a longer stroke risks driving the lift arm into over-travel — past the mechanical end stop — which puts stress on the linkage and can damage pivot points.
The 20 mm question — TEQ300.59.001A vs QY350.59.003:
The QY350.59.003 has a 140 mm stroke — 20 mm more than the TEQ300.59.001A. If your machine’s existing cylinder has a 120 mm stroke, the QY350.59.003 is not a direct replacement. Those 20 mm of additional stroke translate to additional implement travel that the machine’s linkage was not designed to accommodate. In practice, the lift arm may reach a physical stop before the QY350 cylinder reaches its full extension, which means the cylinder will always be operating in a mechanically over-constrained position — a condition that shortens cylinder life and stresses the linkage.
35 mm Rod Diameter
The 35 mm rod is proportionate for a 63 mm bore cylinder operating at the stroke and pressure ranges typical of agricultural lift applications. A larger rod cross-section compared to the NF63C’s 32 mm rod offers marginally improved stiffness under compressive loading and better resistance to side-loading forces that can arise from minor misalignment in the lift linkage.
For replacement purposes, the rod diameter directly affects the rod-end connection — the clevis or eye dimensions and pin diameter will be sized for a 35 mm rod. Confirm that the replacement’s rod-end connection matches the bracket geometry on the machine before ordering, particularly if you are sourcing from a different base model than the original.
Cylinder Force and Tractor Lift Capacity Are Different Things
The theoretical force this cylinder can generate — calculable from bore area and pressure — is a property of the cylinder alone. What a tractor can actually lift at its hitch points is determined by the entire lifting system: the length of the lift arms, where the cylinder attaches to them, the angle at which it acts on the pivot, the mechanical efficiency of the linkage, and the geometry of the three-point hitch if present.
Tractor rated lift capacity figures in manufacturer brochures come from standardized machine-level tests. Those numbers cannot be derived from cylinder bore and pressure alone. A cylinder generating 50 kN of force at the rod tip does not mean the hitch lifts 5 tonnes — the linkage geometry converts and redistributes that force in ways that are machine-specific. Do not use cylinder bore and a pressure estimate to predict hitch lift capacity for an unfamiliar machine.
Measurement Guide for TEQ300.59.001A Replacement
Because three cylinders share the same bore, rod, and mounting distance in the 300 mm subgroup, measuring only those three dimensions is not sufficient to confirm the correct model. Stroke measurement is essential.
Critical measurements for this replacement:
- Stroke — confirm 120 mm: Fully extend the cylinder (safely, under controlled conditions) and measure pin-center to pin-center; subtract retracted length (300 mm). If the cylinder cannot be extended, check machine service documentation for stroke specification.
- Bore — confirm 63 mm: Measure inside barrel diameter or calculate from outside diameter minus barrel wall thickness × 2
- Rod diameter — confirm 35 mm: Calipers on clean, undamaged rod
- Mounting distance — confirm 300 mm: Pin-center to pin-center, fully retracted
- Pin diameters: Both ends; may differ; measure with calipers
- End connection type: Clevis, eye, or other at both ends
- Port thread: Type (NPT, BSP, metric), size, number of ports, location on body
If the cylinder is damaged and stroke cannot be measured directly: The machine’s service manual or parts catalogue is the most reliable source for confirming the original cylinder specification. Alternatively, measure the visible rod travel when the machine’s lift control is operated — from the retracted position to the point where the lift arm reaches its mechanical stop. That travel distance is an approximation of the cylinder stroke, subject to the linkage ratio of the specific machine.
Diagnosing Hydraulic Lift Problems
Before attributing a hydraulic lift problem to the cylinder, consider the full circuit. Most of the common symptoms have multiple possible causes, and the cylinder is not always — or even usually — the source.
Implement slowly lowers with controls in neutral
Could be: cylinder piston seal bypass, control valve internal leakage, or check valve failure. Test by isolating the cylinder — cap its ports with hoses disconnected. If drift stops, the leakage is in the circuit, not the cylinder. Most drift cases in well-maintained systems originate in the control valve or check valve rather than the cylinder itself.
Lift stops short of maximum height
If the lift arm was previously reaching full height and now stops early, check hydraulic fluid level and filter condition first — pressure loss from low fluid or a clogged filter is a common cause. If pressure is confirmed adequate, check whether the cylinder is reaching its internal stop prematurely, which may indicate the wrong stroke cylinder was fitted at some point.
External oil leakage at rod
Check the rod surface for scoring or pitting before fitting new seals. A damaged rod will destroy replacement seals quickly. If the rod surface is intact, a seal replacement or cylinder rebuild may restore the sealing. If the rod itself is bent or deeply scored, the cylinder body typically needs to be replaced or professionally remanufactured.
Erratic or jerky lift motion
Air in the hydraulic circuit — often introduced after any service work that opened the lines — is the most common cause of erratic cylinder motion. Check oil level and look for signs of aeration in the reservoir. A sticking or worn control valve spool can also produce irregular motion. Contamination from degraded or incorrect hydraulic fluid affects valve and cylinder performance over time.
Requesting a Quotation for TEQ300.59.001A
Given that this cylinder shares its mounting distance, bore, and rod with two other models in the 300 mm subgroup, confirming the stroke in your inquiry saves time and avoids the risk of receiving the wrong cylinder. The most useful information to include:
- Reference number: TEQ300.59.001A
- Confirmed stroke from measurement: 120 mm (the distinguishing dimension in this subgroup)
- Confirmed bore (63 mm), rod diameter (35 mm), mounting distance (300 mm)
- Pin diameters at both ends
- End connection type at both ends
- Port thread type, size, and number of ports
- Single-acting or double-acting (from port count)
- Order quantity
- Machine model and year, if known
- Working pressure, if known from machine documentation
- Photos of existing cylinder — both ends, side view, port detail
Frequently Asked Questions — TEQ300.59.001A
Can the TEQ300.59.001A replace the QY350.59.003 (140 mm stroke)?
Not as a direct replacement if the machine was designed for 140 mm of stroke. The TEQ300.59.001A will install correctly — same mounting distance, bore, and rod — but its 120 mm stroke means the lift arm will reach its full extension 20 mm shorter in cylinder travel. Depending on the linkage ratio of the machine, that 20 mm translates to a measurable reduction in maximum lift height. The reverse is also true: a QY350.59.003 fitted to a machine designed for the TEQ300.59.001A will attempt to extend 20 mm further than the linkage was designed to permit.
Does a longer stroke provide more lifting force?
No. Stroke and force are independent. Hydraulic cylinder force is determined by bore area multiplied by pressure — that calculation does not involve stroke at all. A 120 mm stroke cylinder and a 140 mm stroke cylinder with the same 63 mm bore generate identical theoretical extension force at the same pressure. The only thing stroke changes is how far the rod travels, and therefore how far the lift linkage moves.
I measured the bore and mounting distance correctly — is that enough to confirm the right cylinder?
Not for this model. Three cylinders in this range — YC504D.55.501, TEQ300.59.001A, and QY350.59.003 — all share the same 63 mm bore, 35 mm rod, and 300 mm mounting distance. Measuring only those dimensions leaves three possibilities. The stroke — 100 mm, 120 mm, or 140 mm — is the dimension that identifies which one you need. Measure the stroke of your existing cylinder to confirm the correct replacement.
What happens if I fit a cylinder with the wrong stroke length?
If the replacement stroke is too short: the lift arm will not reach its designed maximum height, because the cylinder reaches its internal stop before the linkage completes its travel. The machine still works but with reduced implement position range. If the replacement stroke is too long: the cylinder attempts to travel further than the linkage allows. The lift arm hits its mechanical stop while the cylinder is still pressurized and trying to extend — this forces the cylinder to work against a dead stop repeatedly, which stresses the cylinder end caps, pivot pins, and lift arm mounting points. Over time this causes premature wear or structural damage.
How do I measure stroke if the cylinder is seized and cannot be extended?
Check the machine’s original service manual or parts catalogue — the cylinder specification will typically be listed there. If documentation is unavailable, measure the total amount of rod visible outside the barrel when fully retracted; this gives an approximation of the retracted rod extension, from which the maximum rod length can be estimated along with the internal barrel length. For agricultural lift cylinders in this class, photographing the cylinder alongside a ruler and sending images with your inquiry allows a technical assessment before ordering.
Does hydraulic cylinder bore determine how much the tractor can lift?
Bore determines the force the cylinder generates at a given pressure. What the tractor can lift at its hitch points is a function of that force and the mechanical geometry of the lifting linkage — lift arm length, pivot position, the angle at which the cylinder acts on the arm, and mechanical efficiency. The cylinder’s force is an input to that system; rated hitch lift capacity is an output of the whole machine. You cannot reliably estimate hitch capacity from cylinder bore and pressure alone without knowing the complete linkage geometry of the specific tractor.
