SJ ZJ40 Truck-mounted Drilling Rig Cathead Cylinder Accessories

1

Cathead cylinder

Z07150000016AA

High-strength carbon steel alloy (45# steel), precision forged and quenched

1. Long-term high-pressure operation leads to cylinder wall fatigue and deformation; 2. Hydraulic oil contamination causes internal wear of internal components; 3. Improper installation leads to uneven stress distribution.

1. Regularly filter hydraulic oil to keep it clean (particle size ≤ 10μm) and replace filters every 6 months; 2. Check installation alignment quarterly to avoid eccentric load; 3. Avoid sudden pressure changes during operation to reduce impact damage.

2

Cylinder body

P2300218AA

High-strength seamless steel pipe, quenched and tempered for enhanced hardness

1. Hydraulic oil containing hard impurities causes inner wall scratches and wear; 2. Long-term reciprocation of the piston leads to uniform wear of the inner wall; 3. Moisture in hydraulic oil causes internal corrosion.

1. Replace hydraulic oil every 6 months and clean the oil tank thoroughly; 2. Check the inner wall for scratches regularly—polish and repair if found; 3. Keep the hydraulic system dry to prevent moisture intrusion and corrosion.

3

Piston

P0700067AA

Aluminum alloy (6061-T6) with a wear-resistant ceramic coating on the surface

1. Uneven hydraulic pressure distribution leads to local wear of the piston surface; 2. Wear of sealing rings causes oil leakage and abnormal friction; 3. Excessive cylinder operating temperature accelerates material aging.

1. Check the piston surface wear and coating integrity monthly; 2. Replace sealing rings regularly to ensure tight sealing and avoid abnormal friction; 3. Control the cylinder operating temperature below 80℃ to prevent material aging.

4

Piston rod

P0900147AA

Chromium-plated carbon steel (40Cr), high-precision grinding and surface hardening

1. External collision during transportation or operation damages the surface chrome layer; 2. Dust and impurities enter the cylinder, causing wear on the rod surface; 3. Long-term high load leads to bending deformation.

1. Install a protective sleeve to avoid collision during transportation and operation; 2. Clean the piston rod surface with a soft cloth before retracting to prevent dust entry; 3. Check straightness quarterly—correct or replace if bent.

1

End cover

Z07150200003AA

Carbon steel (Q235B), precision machined and surface anti-corrosion treated

1. Uneven bolt tightening during installation leads to end cover deformation; 2. Hydraulic pressure impact during operation causes fatigue damage; 3. External dust, moisture, and corrosive substances cause surface corrosion.

1. Tighten bolts in a diagonal order to ensure uniform force distribution; 2. Install a buffer device to reduce hydraulic pressure impact; 3. Apply anti-corrosion paint annually to the surface to prevent corrosion.

2

Cylinder head

P6013900AA

High-strength cast iron (HT200), surface anti-corrosion and wear-resistant treatment

1. Wear of the sealing surface leads to oil leakage; 2. Internal pressure overload causes cylinder head cracking; 3. Improper disassembly with non-special tools causes damage.

1. Check the sealing surface for scratches and wear regularly—polish if necessary; 2. Never exceed the cylinder’s maximum rated pressure (refer to SJ ZJ40 equipment manual); 3. Use special disassembly tools to avoid mechanical damage.

3

O ring φ101x5.3

P1101688AA

Nitrile rubber (NBR), shore hardness 70±5, high oil resistance and pressure resistance

1. Hydraulic oil aging causes rubber hardening, cracking, and loss of elasticity; 2. High operating temperature accelerates aging; 3. Sharp edges of adjacent parts scratch the O ring during assembly.

1. Replace O rings every 3-6 months or immediately when oil leakage is found; 2. Check adjacent parts for sharp edges before assembly and deburr if needed; 3. Store spare O rings in a cool, dry place away from direct sunlight.

4

O ring φ106x5.3

5300100121

Nitrile rubber (NBR), oil-resistant, acid-resistant, and suitable for high-pressure scenarios

1. Long-term compression leads to permanent deformation and loss of sealing performance; 2. Hydraulic oil contamination causes rubber corrosion; 3. Installation deviation leads to uneven stress.

1. Ensure correct installation position to avoid deviation and uneven compression; 2. Use hydraulic oil that meets the SJ ZJ40 drilling rig’s specifications; 3. Inspect O rings for deformation before assembly.

5

O ring φ41.2 x3.55

4313800060

Nitrile rubber (NBR), flexible and excellent sealing performance

1. Small installation space causes extrusion damage during assembly; 2. Temperature changes lead to rubber contraction/expansion and poor sealing; 3. Impurities between the O ring and sealing surface cause wear.

1. Clean the installation surface thoroughly before assembly to remove impurities; 2. Select the correct size (do not use oversized/undersized O rings); 3. Avoid sudden temperature changes of the cylinder during operation.

6

Y type ring Yx-2-d60

5300100256

Fluororubber (FKM), high temperature resistance (-20℃ to 120℃) and corrosion resistance

1. Reciprocating friction between the piston rod and Y type ring leads to lip wear; 2. Hydraulic oil impurities scratch the lip; 3. High temperature causes rubber aging and brittleness.

1. Check the lip for wear, cracks, or deformation monthly; 2. Ensure hydraulic oil cleanliness (particle size ≤ 15μm); 3. Avoid operating the cylinder beyond the recommended temperature range.

7

Dust ring

4309300024

Polyurethane (PU), wear-resistant, dust-proof, and water-proof

1. External dust, gravel, and debris wear the dust ring surface; 2. Scratches on the piston rod surface cause damage to the dust ring; 3. Long-term exposure to sunlight and rain accelerates aging.

1. Clean the dust ring surface with a soft brush weekly to remove accumulated dust; 2. Check the piston rod surface for scratches and repair promptly; 3. Install a protective cover to avoid direct sunlight and rain erosion.

1

Guiding ring

P1101579AA

Polyoxymethylene (POM), self-lubricating, high hardness, and wear-resistant

1. Eccentric load during operation leads to uneven wear of the guiding ring; 2. Lack of lubrication increases friction between the guiding ring and piston rod; 3. Hydraulic oil impurities cause surface scratching.

1. Ensure the piston and piston rod are concentric during installation; 2. Add high-temperature resistant lubricating grease to the guiding surface every 3 months; 3. Keep hydraulic oil clean to avoid impurity intrusion.

2

Anti-wear ring

P9860284AA

Copper alloy (H62), excellent wear resistance, corrosion resistance, and thermal conductivity

1. Long-term reciprocating friction between the anti-wear ring and piston leads to surface wear; 2. High hydraulic pressure causes material fatigue and deformation; 3. Hydraulic oil containing corrosive substances causes corrosion.

1. Check the anti-wear ring thickness quarterly—replace when worn to the limit (refer to SJ ZJ40 maintenance manual); 2. Control the cylinder operating pressure within the rated range; 3. Use anti-corrosion hydraulic oil.

3

Cushion ring

P1100159AA

Rubber-metal composite material, good shock absorption and buffer performance

1. Hydraulic pressure impact during cylinder start/stop causes rubber layer detachment; 2. Long-term compression leads to permanent deformation; 3. High operating temperature accelerates rubber aging.

1. Check the rubber layer for detachment, cracks, or deformation monthly; 2. Avoid sudden start and stop of the cylinder to reduce pressure impact; 3. Control the operating temperature below 75℃ to slow aging.

4

Cushion sleeve

P1600201AA

Aluminum alloy (6063), surface anodizing treatment for anti-corrosion and wear resistance

1. Impact load during operation leads to cushion sleeve deformation; 2. Wear caused by frequent contact with the piston and other parts; 3. External environment (moisture, dust) causes surface corrosion.

1. Avoid impact load during drilling operations; 2. Check the fit between the cushion sleeve and adjacent parts monthly—adjust if loose; 3. Apply anti-corrosion coating to the surface annually.

5

Guiding ring (additional model)

P1101686AA

Polyoxymethylene (POM), self-lubricating, lightweight, and high wear resistance

1. Eccentric movement of the piston leads to uneven wear; 2. Hydraulic oil contamination causes surface scratches; 3. Long-term high-temperature operation accelerates material aging.

1. Regularly check the guiding ring for cracks and deformation; 2. Replace hydraulic oil and filters on schedule to keep the oil clean; 3. Ensure the cylinder’s operating temperature is within the recommended range.

1

Pinshaft

P2400869AA

Carbon steel (45# steel), quenched and tempered to enhance hardness and toughness

1. Frequent rotation and friction during operation lead to surface wear; 2. Lack of lubrication causes rust and jamming; 3. Impact load during drilling leads to bending or fracture.

1. Add lithium-based lubricating grease to the pinshaft every 2 months; 2. Check the surface for wear, rust, or bending monthly—replace if damaged; 3. Avoid impact load during operation.

2

Press plate

P2300219AA

Carbon steel (Q235B), surface galvanized for anti-corrosion and wear resistance

1. Bolt loosening leads to uneven stress and deformation of the press plate; 2. External dust, moisture, and corrosive substances cause surface corrosion; 3. Friction with adjacent parts causes wear.

1. Check and tighten bolts weekly to ensure uniform force; 2. Clean the press plate surface regularly to avoid corrosion; 3. Check the fit with adjacent parts to avoid excessive friction.

3

Tie rod

P1300105AA

High-strength steel rod (40Cr), precision threaded and surface anti-corrosion treated

1. High tension during operation leads to thread wear and deformation; 2. Corrosion causes thread rust and jamming; 3. Uneven force during tightening leads to bending.

1. Check thread integrity and rust monthly—clean and apply anti-rust grease; 2. Use a torque wrench to tighten to the specified torque (refer to SJ ZJ40 manual); 3. Avoid over-tightening to prevent thread damage.

4

Coupling head

4317008020

Steel casting (ZG230-450), precision machined and surface hardened

1. Torque overload during operation leads to coupling head cracking; 2. Wear caused by frequent connection with the piston rod; 3. External corrosion causes surface damage.

1. Never exceed the maximum rated torque of the coupling head; 2. Check the connection surface for wear and cracks monthly; 3. Apply anti-corrosion paint annually to extend service life.

5

Nut M24

4313100024

Carbon steel (45# steel), heat-treated and surface galvanized

1. Thread wear caused by frequent disassembly and assembly; 2. Vibration during drilling leads to loosening and secondary wear; 3. Corrosion causes thread rust and jamming.

1. Use a torque wrench to tighten to the specified torque; 2. Install a spring washer to prevent loosening due to vibration; 3. Clean the thread and apply anti-rust grease after disassembly.

6

Spring washer 24

5300300062

65Mn spring steel, quenched and tempered for good elasticity and fatigue resistance

1. Long-term compression leads to fatigue deformation and loss of elasticity; 2. Moisture and corrosion cause rust; 3. Over-compression during assembly leads to fracture.

1. Replace the spring washer if deformation, rust, or loss of elasticity is found; 2. Do not over-compress during assembly; 3. Store in a dry, ventilated place to avoid corrosion.

7

Spring washer 12

5300300062

65Mn spring steel, surface anti-rust treated for enhanced corrosion resistance

1. Frequent vibration during drilling causes fatigue fracture; 2. Corrosion leads to rust and loss of elasticity; 3. Improper installation causes deformation.

1. Check the spring washer’s elasticity monthly—replace if damaged; 2. Ensure correct installation direction (curved side facing the nut); 3. Avoid contact with moisture and corrosive substances.

8

Bolt M12x35

4313100012

High-strength bolt steel (10.9 grade), heat-treated for high tensile strength

1. Thread wear caused by frequent disassembly and assembly; 2. Overload during operation leads to bolt fracture; 3. Corrosion causes thread rust and jamming.

1. Tighten to the specified torque—do not overload; 2. Check the bolt for cracks and thread wear monthly; 3. Apply anti-rust grease to the thread to prevent corrosion.

9

Set screw M8x20

5300300081

Carbon steel (45# steel), thread galvanized for anti-corrosion

1. Vibration during drilling leads to loosening and thread wear; 2. Over-tightening causes thread damage; 3. Corrosion leads to rust and difficulty in disassembly.

1. Tighten appropriately—avoid over-tightening; 2. Check and re-tighten every week during drilling operations; 3. Clean the thread and apply anti-rust grease after installation.

10

Elastic retaining ring 60

4313800040

65Mn spring steel, quenched and tempered for good elasticity and wear resistance

1. Long-term expansion leads to loss of elasticity; 2. Wear caused by contact with adjacent parts; 3. Improper installation with pliers causes deformation or fracture.

1. Check elasticity monthly—replace if loose; 2. Use special retaining ring pliers for installation and disassembly; 3. Avoid scratching the retaining ring during assembly.

11

Elastic retaining ring 40

4301312035

65Mn spring steel, surface anti-rust treated

1. Frequent disassembly and assembly causes fatigue fracture; 2. Corrosion leads to rust and brittleness; 3. Installation groove burrs cause wear.

1. Replace if rust, deformation, or brittleness is found; 2. Clean the installation groove and remove burrs before assembly; 3. Store in a dry place to avoid corrosion.

1

Screw plug NPT1/4

P1200114AA

Carbon steel (Q235B), thread anti-rust treated and precision machined

1. Thread wear caused by frequent disassembly and assembly; 2. Vibration during drilling leads to loosening and oil leakage; 3. Corrosion causes thread rust and jamming.

1. Tighten appropriately after installation—avoid over-tightening; 2. Check for oil leakage monthly; 3. Apply thread sealant to enhance sealing performance and prevent rust.

2

Plug NPT1

QBJ120108

Carbon steel (45# steel), quenched and tempered for enhanced hardness

1. Improper installation with non-special tools causes thread damage; 2. High hydraulic pressure leads to seal failure; 3. Hydraulic oil and external environment cause corrosion.

1. Use a torque wrench for installation to avoid thread damage; 2. Check the sealing performance regularly—re-tighten if oil leakage is found; 3. Replace the plug immediately if thread damage occurs.

1

Are all these accessories fully compatible with the SJ ZJ40 truck-mounted drilling rig’s cathead cylinder?

Yes, all accessories are specially designed and produced for the SJ ZJ40 truck-mounted drilling rig’s cathead cylinder (model: Z07150000016AA). Each part’s model and size are strictly consistent with the original equipment, ensuring perfect compatibility. They also comply with EN 16228-7:2014+A1:2021 interface safety standards, guaranteeing stable connection and safe operation.

2

How often should key wearing parts (such as O rings, guiding rings) be replaced to avoid cylinder failure?

The replacement cycle depends on usage frequency and working environment: under normal drilling conditions (8 hours a day, 5 days a week), O rings should be replaced every 3-6 months, guiding rings and anti-wear rings every 12 months, and cushion rings every 8 months. If working in harsh environments (high dust, high humidity, frequent high-pressure operations), shorten the cycle by 30% to prevent unexpected failures.

3

What should I do if the cathead cylinder gets jammed during operation?

First, stop the equipment immediately and cut off the hydraulic supply to avoid further damage to core components. Then check three key points: 1. Whether the guiding ring is worn/deformed (causing eccentric movement); 2. Whether the piston rod is bent; 3. Whether impurities have entered the cylinder. Replace worn parts, correct the piston rod, or clean the cylinder according to the inspection results. Never force the cylinder to move—this will cause severe damage to the cylinder body and piston.