TYW-400 Series Foot Operated Hydraulic Drum Brakes

The TYW-400 series foot-operated hydraulic drum brake is a manually controlled, hydraulically actuated drum brake designed for low-to-medium load industrial equipment that requires simple, intuitive braking operation. It is widely used in scenarios where manual intervention (e.g., foot control) is preferred, such as small cranes, workshop trolleys, and light-duty conveyors. Below is a detailed overview of its core parameters, structural features, working principle, applications, and maintenance guidelines:

Core Technical Parameters

Parameter	Details
Applicable drum diameter	400 mm (matches the "400" in the model name)
Rated braking torque	300–600 N·m (adjustable via hydraulic pressure and spring force)
Hydraulic system pressure	2–5 MPa (generated by foot pedal actuation)
Brake shoe clearance	0.8–1.2 mm (manual adjustment via clearance screw)
Brake lining specification	Non-asbestos semi-metallic lining, thickness 12 mm (replace when ≤3 mm)
Foot pedal stroke	150–200 mm (adjustable for operator comfort)
Oil type	ISO VG 32/46 hydraulic oil (for the integrated hydraulic cylinder)
Operating environment	Ambient temperature: -20°C to +50°C; Relative humidity: ≤90%
Total weight	~65–75 kg (includes brake body and foot hydraulic pedal unit)
Compliance standards	JB/T 6406-2006 (drum brake technical requirements), GB/T 3811-2008 (crane design standards)

Structural & Design Features

Integrated Foot-Hydraulic Control System

The brake consists of two key parts: the drum brake body (mounted on the equipment) and the foot-operated hydraulic pedal unit (installed near the operator's position, connected via a high-pressure hydraulic hose).

The pedal unit includes a small hydraulic pump, a pressure relief valve, and a return spring-eliminating the need for external power sources (e.g., electricity or compressed air).

Fail-Safe Auxiliary Spring Design

While primarily foot-hydraulically actuated, it is equipped with a secondary return spring for emergency braking. If the hydraulic system fails (e.g., hose rupture), the spring will drive the brake shoes to clamp the drum, preventing load slippage.

Adjustable Braking Force

The braking torque can be adjusted in two ways:

Hydraulic pressure adjustment: Rotate the pressure relief valve on the pedal unit to change the maximum hydraulic pressure (higher pressure = larger braking torque).

Mechanical adjustment: Adjust the tension of the auxiliary spring via the adjusting nut on the brake body for fine-tuning.

Durable & Low-Maintenance Structure

Main hinge points are equipped with self-lubricating bearings to reduce wear and avoid frequent lubrication.

Brake linings use a clip-on design for quick replacement without disassembling the entire brake body.

The hydraulic cylinder features a sealed structure to prevent oil leakage and dust ingress.

Working Principle

The TYW-400 operates on a hydraulically released, spring-auxiliary braking principle (reverse of most power-driven brakes), tailored for manual control:

Normal Operation (Release State)

When the operator presses the foot pedal, the integrated hydraulic pump generates pressure, which is transmitted through the hydraulic hose to the brake's hydraulic cylinder.

The hydraulic cylinder pushes the brake arms apart, retracting the brake shoes from the drum-releasing the brake and allowing the equipment to run.

Braking State

When the operator releases the foot pedal, the hydraulic pressure drops. The return spring in the pedal unit resets the pump, and the brake's auxiliary spring drives the brake shoes to clamp the drum, achieving braking.

For emergency braking: The operator can press the pedal harder to increase hydraulic pressure temporarily, or the auxiliary spring will activate automatically if the hydraulic system fails.

Parking Braking

A locking pin is provided on the foot pedal. After braking, the pin can be engaged to lock the pedal in the released position (for long-term parking, preventing accidental actuation).

Typical Applications

The TYW-400 series is ideal for equipment that requires manual, on-demand braking and does not have access to power sources. Key applications include:

Small-Scale Lifting Equipment: Workshop electric hoists, jib cranes, and manual cranes (for load lowering control and parking braking).

Light-Duty Conveyors: Small belt conveyors, roller conveyors, and material handling trolleys (for speed control and emergency stop).

Specialized Industrial Machinery: Mobile workshop equipment, agricultural machinery (e.g., small grain conveyors), and ship deck auxiliary equipment (for manual braking in non-powered areas).

Maintenance Platforms: Elevated work platforms and scaffolding trolleys (for safe parking on slopes).

Maintenance Guidelines

The TYW-400's simple structure minimizes maintenance, but regular checks are critical to ensure hydraulic system integrity and braking performance:

Daily Inspection

Check for hydraulic oil leaks (hoses, cylinder connections, pedal unit). Wipe oil stains and tighten loose fittings immediately.

Test the foot pedal stroke and braking response-ensure the brake releases smoothly when the pedal is pressed and clamps firmly when released.

Clean the brake drum surface to remove dust, oil, or debris (oil contamination will reduce braking force).

Periodic Maintenance (Fixed Intervals)

Cycle	Core Tasks	Details & Standards
1 Month	Lining & Clearance Check	- Measure lining thickness: Replace if ≤3 mm.- Adjust brake shoe clearance to 0.8–1.2 mm (equal on both sides) via the clearance screw.
3 Months	Hydraulic System Inspection	- Check hydraulic oil level in the pedal unit (top up with ISO VG 32/46 oil if low).- Inspect hydraulic hoses for cracks or aging (replace if damaged).- Lubricate self-lubricating bearings at hinge points with a thin layer of lithium-based grease.
6 Months	Comprehensive Overhaul	- Disassemble the hydraulic cylinder and replace seal rings (prevent oil leakage).- Test the auxiliary spring for fatigue (replace if deformed or broken).- Re-tighten all mounting bolts (brake body and pedal unit) to the specified torque (40–50 N·m for M10 bolts).
12 Months	Brake Drum & Lining Replacement	- Resurface the brake drum if deep scratches (≥0.2 mm) are present; replace if runout exceeds 0.15 mm.- Replace brake linings if wear is uneven or close to the limit.

Common Faults & Fixes

Fault	Possible Cause	Solution
Brake fails to release	Hydraulic pressure insufficient, blocked hose, or stuck brake arm	Bleed air from the hydraulic system; check for hose blockages; lubricate brake arm hinge points.
Weak braking force	Oil leakage, worn linings, or loose auxiliary spring	Tighten hydraulic fittings; replace linings; adjust spring tension.
Foot pedal jams	Rusty pedal pivot or contaminated hydraulic oil	Lubricate the pedal pivot; drain and replace hydraulic oil.
Oil leakage from cylinder	Damaged seal rings	Disassemble the cylinder

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