To dismount interference-fit bearings, gears, couplings, and mine haul wheels without jaw slippage, calculate minimum puller capacity using the 7–10 Tons per Inch of Shaft Diameter Rule (approximately 0.30 to 0.40 metric tons per millimeter of shaft diameter; double to 0.60 T/mm for rusted or heat-shrunk hubs). Always configure a 3-jaw self-centering cage whenever circumference access allows, and verify that puller reach (L) equals or exceeds shaft overhang plus hub thickness.
1. The 3 Mandatory Sizing Parameters: Tonnage, Reach, and Spread
Selecting an undersized puller is the primary cause of bent spindles and fractured jaws during plant maintenance. Before ordering a hydraulic puller set, measure three physical dimensions on the workpiece:
- 1. Required Pulling Tonnage (Shaft Diameter Formula): For standard press-fit bearings and gears, multiply shaft diameter in inches by 7 to 10 tons (or shaft diameter in mm × 0.35 metric tons). Example: A bearing mounted on a 100 mm (4") shaft requires at least a 30 to 50 Ton hydraulic puller (HAP-LS112E 30T or HAP-LS116E 50T).
- 2. Maximum Reach (Depth from Shaft End to Back of Part): Measure from the tip of the shaft to the rear pulling face of the bearing or pulley. The puller's rated max reach must exceed this distance.
- 3. Maximum Spread (Outer Diameter of the Workpiece): Measure the outside diameter (OD) of the gear or bearing race and select a puller with sufficient spread clearance.
2. 2-Jaw vs. 3-Jaw Pullers & Why Self-Locking Safety Cages Eliminate Jaw Slippage
HydraStark resolves jaw slippage through three mechanical architectures:
- 3-Jaw vs. 2-Jaw Convertible Pullers (HAP-I, HAP-M, HAP-C): HAP-I integrated pullers (7 models, 4–50 Ton), HAP-C synchronous pullers (6 models, 7–60 Ton), and HAP-M multi-functional sets (6 sets, 5–50 Ton) distribute pulling force evenly at 120° in 3-jaw mode.
- Self-Locking Safety Cage Pullers (HAP-L Hydraulic 5–50 Ton & MAP-L Mechanical 2–40 Ton): MAP-L mechanical pullers (12 models, 2–40 Ton, 12–635 mm spread) and HAP-L hydraulic sets (5 complete turnkey sets
HAP-LS106EtoHAP-LS116E, 5–50 Ton, 127–362 mm cylinder stroke) use a threaded safety cage to lock all 3 jaws around the workpiece like a lathe chuck. - 4-in-1 Master Puller Sets & Bearing Splitters (HBP-M 8–50 Ton, HBP-X 8–50 Ton, HBP-B): Wedge behind flush bearings where standard jaw hooks cannot fit.
3. Heavy-Duty Wheeled Pullers for 50–500 Ton Mining, Rail & Marine Couplings
For large crushers, wind turbine main shafts, railway wheelsets, and marine propellers, the HVP-W Series Wheel-Mounted Mobile Pullers (5 models, 50 to 500 metric tons, up to 2,200 mm spread) and HVP Vehicle-Mounted Pullers (4 models, 100 to 200 metric tons) provide remote-controlled hydraulic pulling with powered vertical lift frames.
4. Sizing & Selection Matrix: HydraStark Hydraulic Puller Families (2 to 500 Ton)
| HydraStark Series | Capacity Range | Recommended Shaft Diameter | Max Reach / Spread | Key Mechanism & Included Pump |
|---|---|---|---|---|
| MAP-L Series (12 models) | 2 – 40 Ton | 10 – 115 mm (0.4" – 4.5") | 106–622 mm / 12–635 mm | Mechanical spindle + self-locking safety cage (no pump needed) |
| HAP-I Series (7 models) | 4 – 50 Ton | 15 – 140 mm (0.6" – 5.5") | 185–500 mm / 255–980 mm | Integral self-contained pump + 2/3-jaw convertible linkage |
| HAP-L Series (5 sets) | 5 – 50 Ton | 20 – 150 mm (0.8" – 6.0") | 127–362 mm cylinder stroke | 3-jaw safety cage + HPM-S steel hand pump, HSH-7206 hose & HSG-2510 gauge |
| HAP-M Series (6 sets) | 5 – 50 Ton | 20 – 150 mm (0.8" – 6.0") | 160–700 mm / 210–860 mm | Multi-functional set: 2/3-jaw puller + HPM-S hand pump kit |
| HBP-M Series (4 sets) | 8 – 50 Ton | 25 – 150 mm (1.0" – 6.0") | 300–695 mm / 100–580 mm | 4-in-1 master bearing splitter, cup puller & crossbeam with HPM-S pump |
| HVP-W (5) / HVP (4 models) | 50 – 500 Ton / 100 – 200 Ton | 125 – 600 mm (5" – 24") | 455–1,220 mm / 660–2,200 mm | Wheeled mobile cart + electric hydraulic pump & hydraulic lift frame |
Frequently Asked Questions (FAQ)
How do I calculate the hydraulic puller tonnage needed for a rusted or heat-shrunk coupling?
Start with the standard shaft formula (Shaft Diameter in mm × 0.35 Ton, or Shaft Diameter in inches × 7–10 Ton), then multiply by a 1.5x to 2.0x corrosion factor. For example, a 100 mm shaft with a corroded quarry crusher pulley requires 100 × 0.35 × 1.4 ≈ 50 Tons—select the 50 Ton HAP-LS116E self-locking puller set or HVP-W-50S mobile cart.
What is included in a complete HydraStark HAP-L self-locking hydraulic puller set?
Every HAP-L puller set (HAP-LS106E through HAP-LS116E, 5 to 50 Ton) ships as a complete 700 Bar turnkey kit: the 3-jaw safety-cage puller frame, detachable long-stroke hydraulic cylinder (127–362 mm stroke), matched all-steel hand pump (HPM-S-300, HPM-S-700, HPM-S-1000 or HPM-S-2000), 1.8 m high-pressure hose (HSH-7206), stainless liquid-filled pressure gauge (HSG-2510), and gauge adaptor (HGA-003).
When should I use a bearing separator (splitter) instead of standard puller jaws?
Use an HBP-S bearing separator or HBP-M / HAP-M master puller kit whenever the gap behind the bearing or gear is too narrow for standard jaw tips to hook securely, or when pulling thin-walled inner bearing races that would deform under point-contact jaw loads.