First, locate the rotor assembly–this model’s core uses five tined wheels arranged in a staggered offset. Each wheel measures 140 cm in diameter with 60 spring-loaded tines spaced at 7.5 cm intervals. Replace tines individually if bent beyond 30 degrees; standard part numbers range from 87351015 to 87351030 depending on length.
Check the pivot arm bushings (part 83808520) every 200 operating hours. Worn bushings increase lateral play, causing uneven windrow formation. Grease points require lithium-based lubricant (NLGI #2) applied via the zerks at each joint–avoid petroleum-based alternatives to prevent seal degradation.
The tongue adjustment mechanism includes a dual-hole pivot plate; align holes with a 1 mm tolerance for proper hitch linkage. Misalignment leads to inconsistent ground pressure, particularly in wet conditions. Verify torque on anchor bolts (M16×1.5) at 85 Nm–loosening will skew the working angle.
For the gearbox, use SAE 80W-90 differential fluid (part 84617000). Drain and refill at 500-hour intervals; early signs of failure include metallic particles in the oil or whining under load. The input shaft seal (87311045) should be inspected annually–replace if leakage exceeds 5 ml per hour.
Refer to the technical schematic for electrical components: the rotor engage solenoid (part 37511000) activates at 12V DC, while the indicator panel (part 39805000) shows operational status via LED–amber indicates engagement, red signals hydraulic pressure drop below 7 MPa.
Comprehensive Guide to 55 Series Hay Tool Component Layout
Begin repairs by locating the tine arm assembly (Part No. 84297348) near the rotor hub–this area frequently requires adjustments due to wear from field debris. Use a torque wrench set to 45-50 Nm when tightening bolts to prevent stress fractures in the mounting plate. The bearing housing (Part No. 84300521) should be inspected every 150 operating hours; replace immediately if play exceeds 0.3mm or if grease contamination is visible. For the pivot shaft, apply NLGI Grade 2 lithium grease sparingly–over-lubrication attracts dirt, accelerating bushing erosion.
Identify the hydraulic cylinder (Part No. 84311739) by its dual-action ports; mismatched hydraulic fittings (SAE J514 standard) will cause leaks–verify thread pitch M18×1.5 before connection. The ground drive gearbox requires ISO VG 150 oil at 1.2 liters capacity; drain contaminants every 500 hours using the bottom plug, not the fill port. When replacing curved tines, pair left/right sets simultaneously to maintain balance–mismatched lengths create uneven windrows. For electrical faults, test the rotor speed sensor with a multimeter: resistance should read 120-180 ohms; values outside this range indicate internal corrosion.
Finding Critical Elements in the 55 Series Hay Tool Schematic
First, identify the central rotary assembly–typically marked with a numbered callout near the gearbox housing. This area connects to the tine arms and requires frequent inspection. Look for a circular or star-shaped hub with bolt holes; that’s your starting point.
Next, trace the camshaft running parallel to the axle. It’s often labeled with arrows or directional symbols in the blueprint. The camshaft controls the engagement of the rotary fingers, so verify its alignment with the drive belt pulleys before disassembly.
Locate the tension springs between the tine brackets. These small but critical components regulate pressure on the picking mechanism. In most schematics, they’re depicted as coiled lines adjacent to hinged joints–cross-reference their placement with the tensioner bar.
The wheel assembly appears at the outermost edges of the illustration. Check for split rims, bearings, and hub seals. The diagram usually splits this section into exploded views: one for the hub components and another for tire mounting hardware.
Examine the header frame section for pivot points and hydraulic fittings. These are usually marked with hydraulic symbols (lines ending in circular connectors). Confirm that all hoses match the schematic’s color-coding–red for pressure, blue for return.
- Bearings: Look for shaded circles with crosshatching near rotating joints.
- Gaskets: Thin lines separating housing sections–often labeled with fluid symbols.
- Shear bolts: Short cylindrical icons near gear couplings, usually with warning notations.
Finally, note the electrical connectors at the rear of the machine. These are tiny but distinct in the layout–search for terminal blocks or wiring harness symbols branching toward lights or sensors. Match the pin configurations exactly if replacements are needed.
How to Pinpoint Exact Components for Your 55 Series Hay Tool
Locate the serial plate on the machine’s main frame–typically riveted near the drawbar or under the gearbox cover. This plate provides the precise model variant and production year, critical for sourcing compatible tines, bearings, or cam assemblies. Cross-reference these digits with the official service manual’s compatibility matrix: for example, pre-2018 units use camshafts with 12-mm journals, while 2019-onwards models switch to 14-mm.
Inspect wear patterns to narrow down replacements. Curved tines bending past 25° at the midpoint signal fatigue–replace in matched sets to maintain balanced pressure across the working width. Bearings exhibiting micro-pitting on the inner race (visible at 10x magnification) must be swapped along with their paired seals; mixing old seals with fresh bearings cuts service life by 60%. Use a feeler gauge to verify clearance on rebuilt rotor assemblies: 0.1–0.2 mm between blade tip and alignment track ensures consistent raking depth.
- Tine replacement: Remove cotter pins, slide worn tines off splined shaft, then fit the new set with the scalloped edge oriented toward the centerline–incorrect orientation reduces swath uniformity.
- Gearbox inspection: Drain lubricant, remove side panel, inspect helical gears for face wear exceeding 0.8 mm; if present, replace both gear halves and replenish with ISO 460-rated hypoid oil.
- Wheel hub rebuild: Press out old bearings using a 6-ton arbor press, install new 6204-2RS sealed bearings with interference fit, then torque axle nut to 68 Nm–over-tightening distorts races.
Consult the exploded-view sheet for torque specifications: rotor shaft bolts require 88 Nm, while drawbar pivot pins need 72 Nm. After assembly, cycle the unit through three full rotations while monitoring hydraulic pressure–spikes above 21 MPa indicate misaligned linkage, prompting re-check of pivot bushings.
Key Components Prone to Degradation on the NH 55 Hay-Merger and Schematic Locations
Replace tine arms every 400–600 working hours or immediately if bending exceeds 15 mm from original curvature. Locate arm assemblies on sheet 3, zone B-2 of the official breakdown view–look for callouts 17–22 on most revisions. Keep two spare sets pre-bent to original specs; incorrect re-bending creates stress fractures within 50 hours of resumed operation.
Inspect rubber tine tips at shift-end; crack depth beyond 3 mm signals imminent detachment. Reference callout cluster 28–35 on sheet 4, zone D-1 for exact spares–measure tip diameter before ordering, as three length variants exist (45 mm, 50 mm, 55 mm). Store replacements in climate-controlled bins to prevent premature hardening.
Pivot bushings on the merger head arm (sheet 5, callout 42) wear asymmetrically–left side typically fails 20 % faster due to field-centric turning loads. Grease every 8 hours with lithium-based EP2, ensuring zerk fittings extend 5 mm beyond housing to prevent blockage from crop debris. When axial play exceeds 0.8 mm, swap bushings; DIY bushing presses risk seal misalignment, causing uneven wear.
Wheel hub bearings (callouts 57–60, sheet 6–outer lane) last 750–900 hours if contamination is kept below ISO 19/16 cleanliness; use magnetic drain plugs and change oil at 150-hour intervals. Replace bearings as a matched pair to prevent radial run-out; install spacers precisely at 0.2 mm tolerance or tracking alignment drifts within two seasons.
Check drive belt deflection weekly–proper tension allows 12 mm sag at midpoint between sheaves (sheet 2, callout 9). Replace belts exhibiting single-strand fray or sidewall cracking deeper than 0.5 mm; aftermarket belts often mismatch cord angle, reducing service life to 300 hours versus OEM’s 600-hour benchmark.
Locating Genuine Brand 55 Hay Merger Schematic Resources
Start your search at the manufacturer’s dedicated portal: newholland.com. Navigate to the support section, then select “Equipment Manuals.” Filter by model number 55 and product category “Hay Tools.” The platform hosts interactive schematics in PDF form, compatible with standard browsers. Files are indexed by assembly group–front tine arms, mainframe pivot points, wheel hubs–so pinpointing the exact exploded view takes under 60 seconds.
| Portal | File Format | Indexing Level | Update Frequency |
|---|---|---|---|
| Manufacturer Portal | Component | Quarterly | |
| Authorized Reseller Sites | JPEG, SVG | Sub-Assembly | Monthly |
| Agricultural Forums | PNG, ZIP | Full Assembly | Irregular |
Authorized dealers maintain secondary schematics. Sites such as tractorsupply.com and farms.com host downloadable diagrams beneath each spare item listing. Look for the “Technical Drawings” tab; these visuals are exported directly from the factory CAD system and display torque specifications alongside part numbers. Rotate the image zoom tool to inspect assembly sequences without software installation.
Mechanic forums aggregate schematics uploaded by certified technicians. agriculture.com and tractorbynet.com archive attachments in thread replies. Search model variant–rear-tine versus side-delivery–using site-specific filters. Threads from 2020 onward usually contain vector files compatible with tablet annotation tools.
Cloud storage groups maintain curated repositories. Google Drive folders shared within private circles offer layered schematics saved as native CAD exports. Request access via email listed on dealer bulletin boards; response typically arrives within 12 hours. Ensure files match serial plate revision date–diagrams marked “Rev C” reflect the latest hydraulic valving layout.
Mobile apps serve swipe-ready schematics. Brands like FarmLogs embed interactive renderings behind subscription paywalls. Download the manufacturer’s branded application, available for both iOS and Android, to toggle between assembly steps and part location cross-sections. Offline mode retains full resolution even without cellular signal.
Aftermarket pattern makers provide complimentary exploded views. Manufacturers such as Agri Supply and Steiner distribute PDF handbooks that map branded assemblies to universal equivalents. Match critical dimensions–shaft diameter, mounting hole spacing–as discrepancies beyond 0.5 mm typically affect output alignment.