YWZ8-315/E30A Electro-hydraulic Drum Brakes

The YWZ8-315/E30A is a light-to-medium duty electro-hydraulic drum brake (315 mm drum diameter, paired with ED30/5A thruster), designed for working/parking braking of small-to-medium cranes, conveyors, and hoists, featuring automatic wear compensation and reliable fail-safe operation.

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Core Specifications

Parameter	Value
Drum diameter	315 mm
Rated braking torque	300 N·m (adjustable range: 125–300 N·m)
Matched thruster	ED30/5A (300 N thrust, 50 mm stroke)
Brake clearance	0.8–1.2 mm (auto-compensated when worn)
Friction lining	Non-asbestos, thickness 14 mm (replace when ≤4 mm)
Operating system	Normally closed (spring-applied, electro-hydraulic released)
Ambient temp	-20 °C to +50 °C
Relative humidity	≤90%
Weight	~42 kg
Installation center height	200 mm
Insulation class	B (thruster motor)
Action frequency	Up to 1200 times/hour
Standards	JB/T6406-2006, DIN15435

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Structure & Working Principle

Structure: Reinforced brake frame + left/right brake shoes + high-stiffness return spring + automatic wear compensation mechanism + ED30/5A electro-hydraulic thruster + fixed base. Main hinge points use self-lubricating bearings for low friction and long life.

Fail-Safe Operation:

Power-on (release): Thruster motor activates, hydraulic pressure pushes the pushrod upward. Lever mechanism retracts brake shoes, compresses the return spring, and the brake releases.

Power-off (braking): Thruster loses power, pushrod retracts via spring force and gravity. Return spring rebounds, driving shoes to clamp the drum for stable braking.

Automatic Compensation: As liners wear, the built-in mechanism adjusts clearance automatically, maintaining consistent braking torque without manual intervention.

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Key Advantages

Low-maintenance design: Automatic wear compensation reduces manual adjustment; self-lubricating hinges eliminate routine lubrication.

Reliable safety: Normally closed structure ensures immediate braking on power failure, preventing equipment drift.

Stable performance: Non-asbestos liners with stable friction coefficient (μ≈0.35–0.4) and good high-temperature resistance.

High action frequency: Up to 1200 cycles/hour, suitable for frequent start-stop applications.

Easy replacement: Snap-in liners allow quick change without disassembling the brake frame.

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Applications

Primary: Working and parking braking for small bridge cranes, electric hoists, light-duty belt conveyors, and stackers in workshops, warehouses, and small ports.

Secondary: Braking for auxiliary mechanisms (e.g., slewing, luffing) of medium-sized lifting equipment in metallurgy, coal, and logistics industries.

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Installation & Maintenance

Installation:

Mount on a rigid base to avoid vibration; ensure drum concentricity (runout ≤0.15 mm) and thruster pushrod alignment (no lateral force).

Connect thruster to 380 V 3-phase power; fill with ISO VG 32/46 hydraulic oil to the specified level.

Verify automatic compensation works; test braking/release flexibility before commissioning.

Maintenance:

Cycle	Maintenance Items
Daily	Check thruster oil level, pipeline leaks, and abnormal noise; clean drum surface oil/debris.
3 months	Inspect liner wear and thruster seal integrity; tighten loose fasteners (lever, base bolts).
6 months	Replace thruster hydraulic oil; check return spring for fatigue (replace if elasticity drops).
12 months	Overhaul thruster (clean pump and piston); replace liners if thickness <4 mm; resurface drum if worn/scratched deeply.
2 years	Replace thruster seals and filter; inspect brake frame for deformation; calibrate braking torque.

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Common Faults & Fixes

Fault	Possible Cause	Repair
Weak braking	Worn liners, spring fatigue, or compensation mechanism jam	Replace liners; adjust/replace spring; clean/lubricate compensation mechanism.
Brake drag/overheating	Compensation jam, stuck pushrod, or oil on drum	Clean compensation parts; lubricate pushrod; clean drum surface.
Thruster fails to extend	Motor phase reversal, clogged filter, or low oil level	Correct motor phase; replace filter; refill hydraulic oil.
Unstable braking torque	Uneven shoe wear or drum deformation	Replace uneven liners; grind drum surface.
Abnormal noise during braking	Loose shoes or damaged liners	Tighten shoe fasteners; replace cracked liners.

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