QJ554-1.31.020 Tractor Power Steering Cylinder | 55mm×248mm

QJ554-1.31.020 Tractor Power Steering Cylinder — 55 mm Bore × 248 mm Stroke Long-Travel QJ554 Series Hydraulic Steering Ram

OEM Part Number	QJ554-1.31.020
Bore Diameter	55 mm
Rod Diameter	32 mm
Stroke	248 mm
Mounting Distance (C-C)	620 mm
Cylinder Type	Double-Acting, Single Body
Seal Material	PU Primary + NBR Backup

Request Pricing — QJ554-1 Series

55 mm bore · 248 mm stroke · 620 mm C-C · FOB Ningbo

Engineering Overview: QJ554-1.31.020 Wide-Track Long-Stroke 55 mm Bore Tractor Steering Cylinder for Extended 620 mm Bracket Span Front Axle

The QJ554-1.31.020 Tractor Power Steering Cylinder sits within the same QJ554 tractor family as Product 8 but occupies a fundamentally different design position. Where the QJ554.31.020-1 uses a 41 mm bore with an unusually thick 35 mm rod for a compact, shock-resistant assembly, the QJ554-1 variant adopts a 55 mm bore with a 32 mm rod and extends the stroke to 248 mm across a 620 mm C-C bracket span. The “-1” suffix in the part number designates a wider front axle sub-variant of the QJ554 platform—one fitted with an extended-width front beam to increase wheel track for row-crop stability or orchard clearance, which in turn pushes the steering cylinder bracket positions further apart and requires both a longer stroke and a wider C-C than the standard QJ554.31.020-1.

The 620 mm C-C is the longest mounting distance among the 55 mm bore cylinders in this series and one of the longest in the entire twelve-product range. Paired with a 248 mm stroke, the stroke-to-C-C ratio is 0.40—lower than most other cylinders in this series—meaning the cylinder occupies a proportionally smaller fraction of its installed length per steering manoeuvre. This is characteristic of long-wheelbase front axle designs where the bracket span grows faster than the steering arm travel requirement as the axle beam is widened. The 32 mm rod is correctly specified for the 248 mm stroke: under fixed-pinned end conditions, the Euler buckling load is approximately 100 kN—a 4.2× safety factor over the 23.6 kN extension force at 12 MPa—adequate for the dynamic lateral loads generated at the wider bracket spacing during field operation.

Primary markets for this cylinder include mid-range four-wheel-drive tractors in the 55–75 hp class configured for wide-row vegetable production, orchard management, and irrigated field cultivation in Australia, the Netherlands, Brazil, and South Korea, where row widths and orchard lane dimensions drive the specification for wider front track settings than standard two-wheel-drive machines carry.

Hydraulic Specifications: 55 mm Bore Force Output, 248 mm Stroke Flow Demand, and Seal Kit for the QJ554-1 Long-Travel Tractor Hydraulic Steering Cylinder

Bore area is 2,376 mm²; rod area is 804 mm² (32 mm rod). At 12 MPa, extension force is 28.5 kN and retract force is 18.9 kN—a retract-to-extend ratio of 66%, the most balanced of any cylinder in this series. The large stroke (248 mm) displaces 589 cm³ per full extension—the highest single-body volume in this twelve-product range. Achieving a 2.0-second lock-to-lock time requires a minimum pump flow rate of approximately 17.7 L/min, which exceeds the capacity of standard compact tractor gear pumps (8–12 L/min) and confirms that this cylinder targets mid-size machines with higher-output hydraulic systems. Tractor technicians fitting this cylinder as a replacement should verify the existing pump nameplate flow rating before installation; if pump capacity is below 15 L/min, the actual lock time will be slower than the OEM specification, and the operator will experience noticeably heavier steering at low engine speed.

Barrel tube is 20# seamless precision steel, bore honed to Ra ≤ 0.4 µm. The 248 mm stroke is the longest honing run in this series, and bore taper control across the full stroke length is the primary manufacturing challenge—the factory honing protocol specifies a maximum bore diameter variation of ≤0.015 mm between the two ends of the 248 mm bore. Rod material is 40Cr alloy steel (AISI 5140), heat-treated to 28–32 HRC core hardness, hard chrome plated to 25–30 µm, and ground to h6 tolerance on the 32 mm diameter. Seal kit: PU piston U-ring, NBR O-ring secondary, PU rod U-seal, and reinforced-fabric PU wiper seal. The reinforced wiper is standard on all cylinders with stroke lengths above 200 mm in this range, addressing the higher contamination exposure of the longer rod section.

Fitment and OEM Cross-Reference: Distinguishing QJ554-1.31.020 from QJ554.31.020-1 by C-C Distance, Bore, and Rod Specification

The two QJ554-series cylinders covered in this range (Products 8 and 9) share only the tractor family name; all five measurable parameters differ. The QJ554.31.020-1 (Product 8) is 41 mm bore / 35 mm rod / 198 mm stroke / 334 mm C-C / 28 mm clevis pin. This QJ554-1.31.020 is 55 mm bore / 32 mm rod / 248 mm stroke / 620 mm C-C / 30 mm clevis pin. The clevis pin diameter steps up to 30 mm H7 on the QJ554-1 variant, matching the 30f7 pin on the wider-axle beam brackets—confirm this before ordering, as the 28 mm and 30 mm pin standards are close enough to appear visually identical but differ by 2 mm in bore diameter, producing either interference (too large) or excessive play (too small) if mismatched. Five-parameter verification: 55 mm bore, 32 mm rod, 248 mm stroke, 620 mm C-C, 30 mm clevis pin.

Installation, Pump Flow Verification, and Maintenance Schedule for the 55 mm × 248 mm Long-Stroke QJ554-1 Tractor Power Steering Cylinder

Verify pump flow rate before installation as described above. Torque 30 mm clevis pin retention fasteners to 65–75 N·m. Port connections are M20×1.5; use new bonded seals and torque to 75–90 N·m. Fill the hydraulic reservoir to maximum before starting. Bleed with eight full lock-to-lock cycles at low idle—the 589 cm³ per-stroke volume requires more bleed cycles than shorter-stroke models to fully purge air from both ends of the circuit. After bleeding, check the reservoir level and top up; the larger circuit volume means a meaningful quantity of oil is absorbed into the cylinder and hoses during initial fill. Inspect wiper seals at 500-hour intervals; replace the full seal kit at 2,000 hours standard or 1,500 hours in wide-row orchard applications where dust and plant debris accumulation on the exposed rod is above average. The 248 mm extended rod surface is the primary contamination zone—confirm the rod surface is clean and unscored at every annual service.

Quality Assurance, Long-Stroke Bore Taper Testing, and B2B Procurement Terms for the QJ554-1.31.020 Tractor Steering Cylinder

Proof test: 21 MPa static, 5 minutes per stroke direction; 20 dynamic cycles at rated pressure (extended cycle count for the longest-stroke cylinders in this range). Internal leakage: ≤3 mL/min at the piston seal. Bore taper measurement is included in the dimensional inspection report for this model—a three-point air-gauge measurement at 10 mm from each bore end and at mid-stroke, reported to ±0.002 mm resolution, accompanies every export batch. Chrome rod samples: 240-hour ASTM B117 salt spray per production batch. Barrel exterior: two-component epoxy primer. MOQ: 10 units; standard pallet: 30 units. Lead time: 10–15 working days FOB Ningbo. Custom options: 35 mm rod upgrade for higher buckling margin in severe-terrain applications, alternative port configurations, FKM seals for chemical-spray orchard environments. OEM white-label documentation available.