Description
1,240 Nm @ 540 rpm
2,250 Nm Peak Torque
60–90 hp
Star Tube Profile
CE Certified
ISO 9001 / TS16949
MOQ 1 pc — LGPD Ready
S8 PTO Drive Shaft — Operating Torque Parameters
Source: Ever-Power Drive Line S Series Catalog — current series highlighted in orange
| Сериялар | Cross mm | Kw @540 | Pk @540 | Nm @540 | Kw @1000 | Pk @1000 | Нм @1000 | MP Nm |
|---|---|---|---|---|---|---|---|---|
| S6 | 30.2×92 | 47 | 64 | 830 | 74 | 100 | 710 | 1,450 |
| S7 | 30.2×106.5 | 55 | 75 | 970 | 87 | 118 | 830 | 1,800 |
| S8 | 35×106.5 | 70 | 95 | 1,240 | 110 | 150 | 1,050 | 2,250 |
| S38 | 38×105.6 | 78 | 105 | 1,380 | 123 | 166 | 1,175 | 2,500 |
| S32 | 32×76 | 39 | 53 | 695 | 61 | 83 | 580 | 1,200 |
| S36 | 36×89 | 66 | 90 | 1,175 | 102 | 139 | 975 | 2,000 |
| S9 | 41×108 | 88 | 120 | 1,560 | 140 | 190 | 1,340 | 2,800 |
| S10 | 41×118 | 106 | 145 | 1,905 | 170 | 230 | 1,650 | 3,500 |
| S42 | 42×104.5 | 79 | 107 | 1,400 | 122 | 166 | 1,175 | 2,500 |
Overview
Product Description
S8 marks the step to the 35 mm cross-kit pin diameter — a significant increase from the 30.2 mm family of S6 and S7. The 35×94 mm cross kit delivers 1,050 Nm at 540 rpm and 1,900 Nm peak. Workshop tooling, pressing fixtures, and snap-ring pliers must be sized for the 35 mm pin — the 30.2 mm tooling used for S6 and S7 is not compatible. This tooling requirement is the practical reason for stocking S8 cross kits separately from the lower series.
S8 and S38 share the same 35×94 mm cross kit and identical torque ratings. The difference between them lies in the tube outer diameter: S38 uses a narrower star tube profile for specific implement input housings that cannot accommodate the standard S8 star tube OD. If the implement manual specifies S38, do not substitute S8 — the tube interference at the housing will prevent correct installation.
S8 is the standard S Series recommendation for forage harvester drive applications in the 65–90 hp class. For implement builders requiring OEM custom shaft configurations — modified length, specific yoke type, or integrated wide-angle CV joint — contact Ever-Power Drive Line with full hitch and implement specifications.
Assembly Diagram — Component Reference
Component reference numbers correspond to part codes in the table below
Component Part Numbers — S8
Source: Ever-Power Drive Line S Series Catalog
| Component | Outer / Outboard | Inner / Inboard |
|---|---|---|
| Cross Kit | 8.01 (Ø35×106.5 mm) | |
| Joint Simple | s8.01B+s8.01+s8.06 | s8.01B+s8.01+s8.07 |
| Splined Yoke | s8.01B | |
| Tube Yoke | s8.06 | s8.07 |
| Star Tube | s8.03 | s8.04 |
Spline Profile Reference
Left: 1-3/8 inch Z6 (540 rpm) — Right: 1-3/4 inch Z20 (1,000 rpm)
Key Features
Star Tube Profile — Six-Lobe Bore
The star (six-lobe) tube cross-section provides the highest torsional rigidity per unit outer diameter of any standard agricultural PTO tube profile. Specified by European implement OEMs for input housings machined to star bore dimensions — incompatible with triangular or lemon tube profiles.
Sealed Cross-Kit Bearings — IP67
Double-lip sealed needle-roller bearing cups, factory-filled with EP2 lithium complex grease. Grease nipple accessible with shield in place. Rated for 350+ hours between maintenance interventions in standard field conditions.
CE Safety Shield — Standard
CE-marked UV-stabilised HDPE bellows guard matched to S Series tube outer diameter. Spring-clip anchors and chain points at both ends. OECD Code 4 compliant. Included as standard with every S Series unit.
Forged 20CrMnTi Steel Yokes
Drop-forged chromium-manganese-titanium alloy steel yokes, normalised and induction-hardened at bearing seat journals. Designed for sustained peak torque applications in large baler and forage harvester duty cycles.
All Spline Standards Available
1-3/8 inch Z6 (540 rpm), 1-3/4 inch Z20 (1,000 rpm), and 1-3/8 inch Z21 push-pin or bolt-clamp yokes. Both ends specified independently at order.
CE + ISO Certification Package
CE Declaration of Conformity, ISO 9001:2015, TS/16949 process certificate, LGPD compliance documentation. SGS third-party batch inspection available on contract orders.
Typical Applications
S Series star tube — 60–90 hp tractor class applications
Large Square Baler Feeder Drive
Feeder rotor and knotter drive on compact square balers in the 65–90 hp class. S8 handles the 1,900 Nm peak eject load with the star tube profile specified by European square baler OEM lines.
Heavy Forage Harvesters
Flywheel and feed roller drive on pull-type forage harvesters. Continuous 1,050 Nm operation at 540 rpm with high inertia peaks. The 35 mm pin diameter step from S7 is the correct response to sustained high-load harvesting duty.
Large Mower-Conditioners — 70–90 hp
Disc mower-conditioner main drive where the implement housing specifies a star tube and the continuous demand exceeds S7 capacity. S8 shares the 35 mm pin diameter with S9 and T8.
Installation and Maintenance
Attach safety chain to a fixed non-rotating point on both tractor and implement
Confirm Torque Class
Calculate implement demand (Nm). Add 20% safety margin. Select the lowest S Series where Nm@540 (or Nm@1000) exceeds the adjusted figure.
Adjust Working Length
Measure coupling centre distance with implement attached. Verify 50 mm min tube overlap at full extension, 80 mm at full compression.
Engage Yoke Connections
Push-pin yoke: engage at PTO stub and confirm audible click and positive retention. Clamp yoke: torque to manufacturer specification.
Anchor Safety Chains
Connect tractor-side chain to guard or frame; implement-side chain to implement body. Verify taut at working height.
Grease Before First Use
Apply EP2 lithium complex NLGI 2 grease (2–3 pumps) to both cross-kit nipples. Service every 8 hours; 4 hours in wet or abrasive conditions.
Frequently Asked Questions
- —S8 and S38 share the same 35×94 mm cross kit and identical torque ratings (1,050 Nm at 540 rpm)
- —Tube outer diameter differs: S38 uses a narrower star tube profile for tighter implement input housings
- —Always follow the implement manual specification — S8 and S38 are not interchangeable at the implement housing
- —Cross kits are dimensionally identical and interchangeable between S8 and S38
- —S8 and T8 share the same 35×94 mm cross kit pin diameter and journal length
- —The cross kit itself is interchangeable; the tube profiles (star vs triangular) are not
- —Order cross kits by series code to ensure the correct assembly for your shaft
- —Snap-ring pliers (internal, for 47 mm bore snap rings)
- —35 mm bearing cup press fitting tool or bench vise with protective jaw covers
- —Circlip removal tool for the 47 mm yoke bore
- —Do not use 30.2 mm tooling from S6/S7 on S8 — pin diameter is different
- —Yes — shear bolt torque limiters are strongly recommended for forage harvester applications
- —Set the release torque below 1,900 Nm (S8 peak) to protect the shaft and harvester gearbox
- —An overrunning clutch is also recommended to prevent back-drive from the flywheel
- —Maximum continuous operating angle at each cardan joint: 25 degrees
- —Maximum momentary angle during implement turns: 45 degrees
- —Operating above 25 degrees continuously accelerates cross-kit bearing wear and should be avoided
Customer Reviews
Eduardo T.
Goiás, Brazil — Forage Harvester Contractor
★★★★★
- S8 has run 600+ hours on pull-type forage harvester duty — cross kits show no play
- Sealed IP67 bearing performance in dusty corn conditions far exceeded the previous open-type shaft
- CE and TS/16949 certificates were accepted for our INMETRO fleet registration
Camila R.
Curitiba, Brazil — Square Baler Service Centre
★★★★★
- S8 is now our standard replacement for all European-spec large square baler feeder drives
- 35×94 mm cross kit cross-references correctly to the OEM parts book
- No housing modification required — star tube fits all housings that rejected T8 triangular tube
Related Products
Shipping and Order Information
MOQ
1 pc (stock)
50 pcs (custom)
Lead Time
7–10 days (stock)
25–30 days (custom)
Shipping
Sea LCL/FCL to Brazil
Air freight available
Trade Terms
FOB Ningbo / Shanghai
CIF Santos available
Сертификаттар
CE Certified
ISO 9001:2015
TS/16949
SGS InspectionLGPD Compliant
OECD Code 4 Shield
Technical Specifications
| Parameter | @ 540 rpm | @ 1,000 rpm |
|---|---|---|
| Power (Kw) | 70 | 110 |
| Peak Power (Pk) | 95 | 150 |
| Continuous Torque (Nm) | 1,240 | 1,050 |
| Peak Torque MP (Nm) | 2,250 | 2,250 |
| Cross Kit | 35×106.5 mm | 35×106.5 mm |
| HP Range | 60–90 hp | 60–90 hp |
| Tube Profile | Star Tube (6-lobe) | Star Tube (6-lobe) |
| Spline Standard | 1-3/8″ Z6 (std) / 1-3/4″ Z20 | 1-3/8″ Z6 / 1-3/4″ Z20 |
| Bearing Seal | IP67 Double-lip sealed | IP67 Double-lip sealed |
| Grease Spec | EP2 Lithium Complex NLGI 2 | EP2 Lithium Complex NLGI 2 |
| Safety Shield | HDPE CE-certified, UV-stabilised | HDPE CE-certified, UV-stabilised |
| Material | 20CrMnTi alloy steel, forged | 20CrMnTi alloy steel, forged |
MOQ — Minimum Order Quantity
Lead Time
Trade Terms (Incoterms)
Standard terms: EXW | FOB | CIF | DAP
On request: FCA | CFR | CPT | CIP | DDP
DDP is not offered as a default. Available for select destinations on request. “DDP worldwide” is not written on product pages.
Manufacturer & Supplier Information
Request a Quote or Sample
S8 PTO Drive Shaft — Request a Quote or Sample
Send your tractor model, implement type, PTO speed, and required quantity. We confirm series, spline profile, shaft length, lead time, and price within 24 hours. New customers may request 1–5 pcs samples at sample price before committing to full order volume.
