JMF29 SWING MOTOR ASSY

5 month ago

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

4 year

Product details

SWING MOTOR

SG025 SH60 /SK60/E70B/307

SG04 HD400/450SEV CAT311/312

MFC65 SH100/120 SK100-2/3

SG08 CAT200B/SH200/HD700/820

M2X96 EX200-2 EX220-2

M2X120 EX200-3 E320L/B SK200-6

M2X146 EX200-5 EX220-5 SK230-6

M2X150/170 EX200-1 SK200-1/3 SK07-N2

M2X210 EX270/280/300-1 HD1250

M5X130 ZAX200/210 CAT320C SK200-8

M5X180 ZAX330/360 HD1430

M2X63 R130/150 SK60-1

KMF90 PC200-3/5 PC220-3/5

KMF160 PC300-3/5 PC400-3/5

MX173 EX200-1/220-1(OLD)

M5X150 CAT300B

1. Product Overview

• Model: JMF29

• Type: Hydraulic Swing Motor Assembly

• Application: Primarily used in the swing mechanisms of excavators, cranes, and other construction machinery to drive 360° rotation of the upper structure (cab and working attachments).

• Core Function: Converts hydraulic energy into mechanical energy for smooth, controlled swing motion.

2. Technical Specifications

【表格】

Parameter JMF29 Specifications

Displacement 29 cm³/rev

Rated Pressure 250 bar (Max 300 bar)

Speed Range 0–15 rpm (stepless)

Braking Method Hydraulic release + spring brake (normally closed)

Output Torque Max continuous torque: ≥500 Nm

Weight Approx. 45–60 kg (varies by config)

Compatible Models 3–5-ton mini excavators (e.g., CAT 303, KOBELCO SK75)

3. Structural Components

• Hydraulic Motor Section:

• Axial piston design for high-efficiency transmission.

• Integrated charge pump and relief valve for overpressure protection.

• Reducer Section:

• Planetary gear reduction mechanism to reduce speed and increase torque.

• Gear material: Alloy steel with surface hardening for wear resistance.

• Brake System:

• Hydraulic Release Brake (HRB) with automatic parking lock.

• Brake pad lifespan: ≥5,000 hours (under normal conditions).

• Sealing System:

• Dual-lip seals to prevent hydraulic oil leakage.

• Dust-proof wiper design to extend bearing life.

4. Performance Features

• Energy Efficiency: Variable displacement motor adjusts output based on load.

• Smooth Operation: Low-speed, high-torque output reduces swing shock.

• Durability: Cast iron housing for harsh operating conditions.

• Easy Maintenance: Modular design allows independent replacement of brakes and bearings.

5. Common Failures & Solutions

【表格】

Symptom Possible Cause Solution

Weak or stuck swing Contaminated oil, internal motor leakage Replace hydraulic oil/filters, inspect motor seals

Brake failure Blocked brake oil line, broken spring Clean brake line, replace spring

Abnormal noise Worn gears, damaged bearings Replace reducer gears/bearings

Oil leakage Aged seals, cracked housing Replace seals, weld repair housing

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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4 year

Main Product: hydraulic motor, gear box, hydraulic pump, hydraulic valve , hydraulic winch , hydraulic system

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