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The TB600 is an 80 mm bore tractor hydraulic lift cylinder with a 35 mm rod, 105 mm stroke, and 425 mm mounting distance. Moving from the 63 mm bore cylinders covered elsewhere in this range to the TB600’s 80 mm bore is not a minor step. The increase in piston area — and therefore theoretical force potential at a given pressure — is approximately 61%. That is a meaningful change, and it has implications for the hydraulic system design of the machine it serves.
Two features of this cylinder’s geometry are worth noting from the outset. First, the 105 mm stroke is short relative to the 80 mm bore — this is a compact-travel, high-force configuration. Second, the 425 mm mounting distance is substantially longer than any cylinder in the 63 mm group, placing this in a different installation envelope. It cannot substitute for any of the 63 mm bore cylinders in this range, and a 63 mm cylinder cannot substitute for it.
Ever-Power supplies the TB600 as an aftermarket replacement for agricultural tractor hydraulic lift applications. Measure all dimensions of the existing cylinder before ordering.
TB600 — Technical Specifications
| Parameter | Value | Notes |
|---|---|---|
| Bore Diameter | 80 mm | ~61% more piston area than 63 mm bore; approximately 27% less than 100 mm bore |
| Rod Diameter | 35 mm | Same rod diameter as TEQ300.59.001A and QY350.59.003; rod-to-bore ratio narrower than those 63 mm cylinders |
| Stroke | 105 mm | Short stroke for an 80 mm bore; contrast with FT800.55A.012 (200 mm stroke, same 80 mm bore) |
| Mounting Distance | 425 mm | Longer than any 63 mm bore cylinder in this range; pin-center to pin-center, retracted |
| طلب | Agricultural tractor hydraulic lift systems | Verify all dimensions against existing cylinder before ordering |
| Supplier | Ever-Power | OEM and aftermarket supply; custom specifications on inquiry |
From 63 mm to 80 mm Bore: What the Change Actually Means
Bore area scales with the square of the radius — which is why a relatively modest increase in bore diameter produces a disproportionately large increase in piston area and force potential. Going from 63 mm to 80 mm bore:
| ثقب | Piston Area | Force @ 160 bar (ref.) | Force @ 180 bar (ref.) |
|---|---|---|---|
| 63 mm | 3,117 mm² | ~49.9 kN | ~56.1 kN |
| 80 mm | 5,027 mm² | ~80.4 kN | ~90.5 kN |
Engineering Reference Note: All force figures are theoretical calculations based on bore geometry and reference pressures only. They are not rated product specifications. Actual force output depends on the system’s working pressure, valve restrictions, and hydraulic circuit losses. No rated pressure for the TB600 has been confirmed by Ever-Power for publication here. Agricultural hydraulic systems commonly operate in a range of approximately 140–210 bar depending on machine design.
The 61% increase in piston area from 63 mm to 80 mm bore means the 80 mm cylinder generates substantially more force at any given pressure. A machine designed around an 80 mm bore cylinder has its lift arm geometry, hydraulic system pressure, and pump capacity all calibrated to work with that force level. Fitting a 63 mm cylinder into a system designed for 80 mm will result in lower-than-designed force output — potentially insufficient to lift the rated implement load at the designed operating pressure. The reverse — fitting an 80 mm cylinder into a system designed for 63 mm — may overload the linkage structure or require the system to operate at lower pressure to avoid exceeding structural limits.
There is a further consideration beyond force: flow rate. A larger bore cylinder requires more hydraulic fluid volume per unit of stroke than a smaller bore. At 80 mm bore, the volume of fluid needed to move the piston 1 mm is approximately 5.0 cm³, compared to approximately 3.1 cm³ for a 63 mm bore. If the hydraulic pump delivers a fixed flow rate, a larger bore cylinder will extend and retract more slowly than a smaller one at the same flow. System designers account for this — which is another reason why bore selection is machine-specific, not an arbitrary upgrade path.
105 mm Stroke: A Short-Travel, High-Force Configuration
At 105 mm, the TB600’s stroke is short relative to its 80 mm bore. This combination — high force potential from the large bore, limited travel from the short stroke — describes a specific machine geometry: one that needs substantial lifting force over a compact range of cylinder travel.
Compare this to the FT800.55A.012, the other 80 mm bore cylinder in this range. The FT800 has a 200 mm stroke — nearly double the TB600’s 105 mm — and a correspondingly longer mounting distance (535 mm vs 425 mm). Both cylinders share the same bore and therefore the same force potential at the same pressure. What differs is the range of lift arm travel each provides. A machine requiring 105 mm of cylinder travel to complete its designed lift range will use the TB600 configuration. A machine requiring 200 mm of travel uses the FT800 configuration. The two are not interchangeable, even though bore and force potential are identical.
TB600 vs FT800.55A.012 — same bore, different geometry:
| Model | ثقب | Rod | Stroke | Mtg. Dist. | Extended |
|---|---|---|---|---|---|
| TB600 | 80 mm | 35 mm | 105 mm | 425 mm | 530 mm |
| FT800.55A.012 | 80 mm | 32 mm | 200 mm | 535 mm | 735 mm |
425 mm Mounting Distance: Why This Places the TB600 in a Different Installation Class
The 425 mm mounting distance — pin-center to pin-center, cylinder fully retracted — is 75 mm longer than the NF63C (350 mm) and 125 mm longer than any of the 300 mm mounting subgroup cylinders. This is not a minor discrepancy. A machine with 425 mm of pivot-to-pivot bracket spacing has its entire lift linkage designed around that distance. A cylinder with a different mounting distance — whether shorter or longer — cannot be installed without modifying the bracket positions or the linkage geometry.
Note also that the TB600.55B.2 — the 75 mm bore cylinder in this product range — shares the same 425 mm mounting distance as the TB600. That alignment is not a coincidence; it suggests both cylinders may serve machines from the same platform family, with bore selection determined by the required force output. Despite sharing the mounting distance, these two cylinders are not interchangeable — bore, rod, and stroke all differ.
When measuring an existing cylinder for replacement, the 425 mm mounting distance is a reliable identifier for the TB600 within this product range — no 63 mm bore cylinder in the range shares it, and the 75 mm bore TB600.55B.2 shares it but differs in bore, rod, and stroke. A buyer who measures 425 mm mounting distance, 80 mm bore, 35 mm rod, and 105 mm stroke has uniquely identified the TB600 configuration.
35 mm Rod on an 80 mm Bore Cylinder
The rod-to-bore diameter ratio on the TB600 is 35/80 = 0.44. For comparison, the FT800.55A.012 (the long-stroke 80 mm bore cylinder) has a 32 mm rod — a ratio of 0.40. In hydraulic cylinder design, a higher rod-to-bore ratio generally improves buckling resistance and side-load tolerance, which can be beneficial for cylinders subjected to lateral forces in their installation.
At 105 mm stroke, buckling is not a significant concern — the unsupported rod length at full extension is short, and the compressive load capacity of a 35 mm rod at this extension length is well within normal engineering margins for agricultural hydraulic applications. The 35 mm rod is more relevant for its end-connection dimensions: pin diameter, clevis width, and eye bore will all be sized for a 35 mm rod. These dimensions must match the machine’s bracket geometry on both the rod end and the base end.
If replacing an existing TB600 with a different-specification cylinder is being considered for any reason, the rod-end connection compatibility is one of the first things to verify — a 32 mm rod will not fit a bracket designed for 35 mm without modification, regardless of whether bore and stroke otherwise match.
Force at the Rod vs Lifting Capacity at the Hitch
The TB600’s 80 mm bore generates approximately 80 kN of theoretical extension force at 160 bar reference pressure. That is the force at the cylinder rod tip, along the cylinder axis. It tells you nothing, directly, about how much load the tractor can lift at the hitch points.
Hitch lift capacity is the product of that cylinder force and the mechanical advantage of the lift linkage — which varies depending on lift arm length, the angle at which the cylinder acts on the lift arm pivot, and where along the arm the cylinder is attached. A cylinder force of 80 kN acting through a favourable linkage geometry might produce 60 kN or more at the hitch. The same force acting through a less favourable geometry might produce significantly less. Tractor rated lift capacity figures in manufacturer specifications are determined by whole-machine testing to standardized protocols — not by cylinder force calculations alone.
This matters practically: if a machine with a TB600 cylinder is struggling to lift its rated implement load, the cylinder may not be the limiting factor. Low system pressure, a worn pump, a stuck relief valve, or linkage geometry degraded by worn pivot pins can all reduce effective hitch lift capacity without any fault in the cylinder itself.
Measuring for TB600 Replacement
The combination of 80 mm bore, 35 mm rod, 105 mm stroke, and 425 mm mounting distance uniquely identifies the TB600 in this product range. All four dimensions are needed to confirm the correct replacement.
Dimensions to record:
- Bore — confirm 80 mm: Inside barrel diameter (bore gauge on disassembled cylinder, or OD minus barrel wall × 2)
- Rod diameter — confirm 35 mm: Calipers on clean rod surface away from any damage
- Stroke — confirm 105 mm: Extended pin-pin distance (530 mm) minus retracted (425 mm)
- Mounting distance — confirm 425 mm: Pin-center to pin-center, fully retracted
- Rod-end pin diameter: Calipers; note separately from base-end pin
- Base-end pin diameter: Calipers; may differ from rod end
- End connection type at both ends: Clevis, eye, trunnion, or other
- Port thread type, size, and count: NPT, BSP, or metric; one or two ports
- Port location: Side port, end cap, or other; photograph if uncertain
- Available clearance: Confirm cylinder body diameter and hose routing space in the installation
A note on bore measurement: For cylinders that cannot be disassembled, bore cannot be measured directly. If the barrel outer diameter and wall thickness are accessible, bore can be estimated. Alternatively, cylinder series number stamped on the body — if legible — is the most reliable identification. For an 80 mm bore cylinder, the barrel outside diameter will typically be in the range of 95–105 mm depending on wall thickness and construction, though this varies by manufacturer and design. If uncertain, photograph the cylinder body and end caps and include them in any replacement inquiry.
Hydraulic Lift Problems: What to Check Before Replacing the Cylinder
For an 80 mm bore cylinder, a few failure modes are worth understanding beyond the generic drift-and-leak symptoms:
Slow lift speed at normal load
An 80 mm bore cylinder needs more flow per unit of stroke than a 63 mm bore — approximately 5.0 cm³ per mm of travel vs 3.1 cm³. If the hydraulic pump is worn and delivering reduced flow, a large-bore cylinder will slow down proportionally more than a small-bore one. Check pump output before attributing slow lift to the cylinder. A worn pump supplying reduced flow will show up as slow operation across all hydraulic functions, not just the lift.
Implement drifts down under load
Cap the cylinder ports to isolate it from the circuit. If drift stops with ports capped, the leak is in the control valve or check valve — not the cylinder. If drift continues with ports capped, the cylinder’s piston seal is a more likely source. On a larger-bore cylinder, the internal leakage rate required to produce visible drift is also larger (more area for fluid to bypass), so occasional minor drift on an older cylinder may originate in the control valve even when the cylinder appears suspect.
Rod seal leakage
Check whether the rod surface is the source of the problem before fitting new seals. A contaminated wiper seal — the outer seal that excludes debris as the rod retracts — is a common cause of premature rod seal failure in agricultural environments. Field debris entering along the rod scratches the seal lip, allowing leakage. Replacing the wiper seal at the same time as the rod seal, and checking the rod surface for scoring, addresses the cause rather than just the symptom.
Noisy or rough lift operation
Cavitation-like noise or rough motion in a large-bore cylinder is often caused by insufficient oil supply at high pump speed — the larger bore volume fills less quickly, and if pump suction is restricted or oil level is low, aeration occurs. Check suction line restriction, oil level, and filter condition before assuming the cylinder is the source of noise or rough operation.
Requesting a Quotation for TB600
The TB600 is distinctly identified by its combination of 80 mm bore, 35 mm rod, 105 mm stroke, and 425 mm mounting distance. Including all four confirmed dimensions in your inquiry removes ambiguity and allows immediate cross-referencing.
- Reference number: TB600
- Confirmed bore (80 mm), rod (35 mm), stroke (105 mm), mounting distance (425 mm)
- Pin diameters at rod end and base end
- End connection type at both ends
- Port thread type, size, count, and location
- Single-acting or double-acting (from port count)
- Order quantity
- Tractor or machine model and year, if known
- Working pressure, if known
- Photos of existing cylinder: full side view, both ends, port detail, any visible markings or damage
- Any special requirements (stroke modification, surface treatment, custom port specification)
Frequently Asked Questions — TB600 Hydraulic Lift Cylinder
How much more force does an 80 mm bore cylinder generate compared to a 63 mm bore?
At the same pressure, approximately 61% more. An 80 mm bore piston has an area of about 5,027 mm² versus 3,117 mm² for a 63 mm bore — a difference of approximately 1,910 mm². At 160 bar reference pressure, that translates to roughly 80.4 kN for the 80 mm bore versus 49.9 kN for the 63 mm bore. These are theoretical figures based on bore geometry and reference pressure; actual system output depends on operating pressure, circuit losses, and valve efficiency.
Can I replace a 63 mm bore cylinder with the TB600 to get more lifting force?
Not without significant modification. The TB600 has a 425 mm mounting distance, versus 300–362 mm for the 63 mm bore cylinders in this range. The bracket pivot spacing on a machine designed for a 63 mm bore cylinder will not accommodate a 425 mm mounting distance cylinder. Additionally, the hydraulic system pressure, pump flow capacity, and linkage structural design are all matched to the original bore size. Fitting a larger bore cylinder into a system not designed for it can overload the linkage and may require the system to operate at reduced pressure to stay within safe limits — which defeats the purpose of the bore increase.
What is the difference between the TB600 and the FT800.55A.012?
Both are 80 mm bore cylinders, so they generate the same theoretical force at the same pressure. The differences are stroke, mounting distance, and rod diameter. The TB600 has a 105 mm stroke, 425 mm mounting distance, and 35 mm rod. The FT800.55A.012 has a 200 mm stroke, 535 mm mounting distance, and 32 mm rod. They represent two different machine geometries using the same bore. The TB600 suits a compact-travel, larger-installation-frame application; the FT800 suits a long-travel application in an even larger installation frame. They are not interchangeable.
Does a larger bore cylinder require more hydraulic flow?
Yes. Flow rate required to move a cylinder at a given speed is proportional to piston area. An 80 mm bore piston displaces approximately 5.0 cm³ per mm of travel. A 63 mm bore piston displaces approximately 3.1 cm³ per mm. At the same pump flow rate, the 80 mm bore cylinder will extend more slowly. Machine designers match pump output, line sizing, and bore selection together as a system. If a replacement cylinder uses a larger bore than the original, confirm that the hydraulic pump can supply adequate flow to maintain acceptable lift speed.
My tractor lifts slowly with the TB600. Is the cylinder at fault?
Slow lift speed in an 80 mm bore cylinder is more often a pump or circuit issue than a cylinder problem. Check hydraulic fluid level and condition, then check the filter. A worn pump delivering reduced flow will slow down all hydraulic functions — not just the lift — and the effect is proportionally more noticeable on a larger bore cylinder. Also check the system relief valve setting; if it is set too low, it may be bypassing flow before full system pressure is reached. A cylinder that is physically intact but with a worn piston seal will typically show as load drift rather than slow speed.
What should I include in a replacement inquiry for the TB600?
The reference number (TB600) plus confirmed bore (80 mm), rod diameter (35 mm), stroke (105 mm), and mounting distance (425 mm) from direct measurement. Add pin diameters at both ends, end connection type, port thread specification and count, and quantity. Photos of the existing cylinder — full side view, both mounting ends, port detail — help confirm end-connection geometry. Machine model and year are useful additional context. If the existing cylinder is damaged beyond measurement, provide whatever partial dimensions and photographs are available along with the machine identification.
