Renqiu Hydraulic Disc Brake Parts for JC40D Drawworks

1

Service Calipers

PS020000

Forged alloy steel (42CrMo), API 8C

1. Piston seizure from hydraulic oil contamination; 2. Body deformation from impact.

1. Use clean ISO VG 46 hydraulic oil; 2. Inspect caliper alignment monthly, adjust if misaligned.

2

Emergency Calipers

PS030000

Alloy steel with anti-corrosion coating, GB/T 3077-2015

1. Spring fatigue affecting emergency engagement; 2. Corrosion from wellsite moisture.

1. Test emergency function daily; 2. Apply anti-rust lubricant to moving parts quarterly.

3

Friction Disc

PS000006

Sintered metal-ceramic composite, high-temperature resistant

1. Abrasion from repeated braking; 2. Thermal degradation at ＞250℃.

1. Avoid continuous heavy braking; 2. Replace if thickness wears below 5mm.

4

Emergency Caliper Cylinder

PS230100

Precision-machined alloy steel, GB/T 1184-1996

1. Inner wall wear from piston movement; 2. Seal failure leading to leakage.

1. Replace seals annually; 2. Clean cylinder inner wall during maintenance.

5

Piston

PS230108

Hard chrome-plated carbon steel (45#)

1. Scratching from contaminated oil; 2. Corrosion from moisture intrusion.

1. Filter hydraulic oil with 10μm filter; 2. Inspect surface for scratches monthly.

6

Hydraulic Cylinder

PS230114

Alloy steel (35CrMo), pressure-tested to 35MPa

1. Cracking from overpressure; 2. Wear at seal grooves.

1. Maintain system pressure ≤25MPa; 2. Check groove wear during seal replacement.

1

Sealing Ring (PS230103)

PS230103

Nitrile rubber (NBR), GB/T 3452.1-2005

1. Hardening from high temperature; 2. Abrasion from piston movement.

1. Replace every 1500 operating hours; 2. Avoid sharp edges during installation.

2

Sealing Ring (PS230104)

PS230104

Fluororubber (FKM), resistant to 200℃

1. Swelling from incompatible oil; 2. Tearing from misalignment.

1. Use oil compatible with FKM; 2. Ensure piston is properly aligned before assembly.

3

Guide Band

PS230106

Polyoxymethylene (POM), wear-resistant

1. Abrasion from lateral force; 2. Deformation from high temperature.

1. Check caliper parallelism; 2. Keep operating temperature below 180℃.

4

Sealing Ring (PS230107)

PS230107

NBR, shore hardness 70±5

1. Extrusion from overpressure; 2. Aging from long-term storage.

1. Operate within rated pressure; 2. Store spare parts in cool, dry environment.

5

Sealing Ring (PS230109)

PS230109

NBR, O-ring standard

1. Cutting from burrs on mating surfaces; 2. Compression set from long-term clamping.

1. Deburr all mating surfaces; 2. Release pressure during long shutdowns.

6

Sealing Ring (PS230110)

PS230110

FKM, chemical-resistant

1. Degradation from oil contaminants; 2. Cracking from low-temperature brittleness.

1. Replace oil filters regularly; 2. Preheat system in ＜-10℃ environments.

7

Elastic Guide Sleeve

PS230111

Rubber-metal composite

1. Tearing from vibration; 2. Deterioration from oil immersion.

1. Inspect for cracks monthly; 2. Use oil-resistant rubber cleaner.

8

Disc Spring

PS230112

Spring steel (65Mn), GB/T 1972-2005

1. Fatigue from repeated compression; 2. Corrosion from moisture.

1. Check deflection monthly; 2. Apply anti-rust coating annually.

9

Copper Bush

PS230113

Brass (H62), self-lubricating

1. Abrasion from rotational friction; 2. Seizure from lack of lubrication.

1. Apply molybdenum disulfide grease; 2. Replace if clearance exceeds 0.2mm.

10

Sleeve (PS230005)

PS230005

Alloy steel, precision-machined

1. Wear from pin movement; 2. Deformation from impact.

1. Ensure proper pin-sleeve fit; 2. Avoid collision during maintenance.

11

Sleeves (PS230007)

PS230007

Carbon steel (Q235B), galvanized

1. Corrosion from salt spray; 2. Wear from lateral load.

1. Inspect zinc coating quarterly; 2. Replace if bent or deformed.

12

Sleeve (PS230012)

PS230012

Alloy steel (40Cr), heat-treated

1. Fatigue cracking from cyclic load; 2. Wear at contact surfaces.

1. Check for cracks with magnetic particle testing annually; 2. Lubricate contact areas weekly.

13

Sleeve (PS230015)

PS230015

Stainless steel (304), corrosion-resistant

1. Pitting from chloride corrosion; 2. Wear from abrasive particles.

1. Clean with fresh water after offshore use; 2. Filter lubricant to remove impurities.

1

Screw, Slotted Countersunk Head

PS000003

Carbon steel (Q235), GB/T 68-2016

1. Stripped threads from over-tightening; 2. Corrosion from moisture.

1. Torque to 15~20N·m; 2. Apply anti-rust paint after installation.

2

Nut, Hex Slotted & Castle

PS000004

Alloy steel (35CrMo), GB/T 6178-1986

1. Loosening from vibration; 2. Wear at slot edges.

1. Secure with split pins; 2. Retorque every 300 operating hours.

3

Split Pin

PS000005

Spring steel (65Mn), GB/T 91-2000

1. Fatigue fracture from vibration; 2. Rust-induced brittleness.

1. Bend pins properly (90°); 2. Replace during every maintenance cycle.

4

Clevis Pin with Head (PS230006)

PS230006

Alloy steel (42CrMo), zinc-plated

1. Shear failure from misaligned load; 2. Wear at pin-head interface.

1. Ensure load is axial; 2. Lubricate pin weekly with lithium-based grease.

5

Clevis Pin with Head (PS230011)

PS230011

Carbon steel (45#), quenched and tempered

1. Abrasion from rotational movement; 2. Corrosion from hydraulic oil.

1. Check clearance monthly; 2. Use oil-resistant anti-rust agent.

6

Clevis Pin

PS230117

Alloy steel, precision-ground

1. Wear from lateral movement; 2. Seizure from corrosion.

1. Install with locking clips; 2. Remove and clean every 6 months.

7

Support Arm

PS230021

Forged alloy steel (Q355B), API 7K

1. Bending deformation from uneven load; 2. Crack at stress points.

1. Distribute load evenly; 2. Inspect for cracks annually with ultrasonic testing.

Are these parts compatible only with Renqiu 65A emergency calipers for JC40D drawworks?

Yes, all parts are customized for Renqiu 65A emergency calipers and JC40D drawworks. Cross-verification with part numbers (e.g., PS030000 calipers) is mandatory, as non-matching parts may cause brake system failure.

What is the recommended hydraulic oil grade for these brake components?

Use ISO VG 46 hydraulic oil compliant with GB/T 14039-2002, with moisture content ＜0.1%. Avoid mixed oil grades, as this degrades seal performance and causes component wear.

How to judge if friction discs (PS000006) need replacement?

Replace when thickness is below 5mm (original thickness 12mm) or if there are cracks exceeding 3mm. Irregular wear indicates caliper misalignment, which must be corrected before installing new discs.