Product name: JCB Boom Arm Stick Swing Cylinder Seal Kit
Part No: 991/00012 991-00012 99100012
Size：60MM / 100MM
Model Number:For 3CX 3D 4C 4CN 530B-HL 415 420 410 412 430 540BM-4
Material:Lron+Rubber
Packing:PP bag inside, carton box outside
Payment Terms:Western Union, L/C, T/T, MoneyGram, D/A, D/P
MOQ:Acceptable trial order
Shipping Mode:By air, by sea, by express(Fedex, UPS, DHL, TNT, etc.)
Place of Origin:Guangdong, China
Brand name:COGENG
CertifiCATEEion:ISO9001
Supply :500PCS
| Parameter |
Specification |
Application Details |
| COGENG Part Number |
COGENG-991-00012-BASC |
"BASC" denotes Boom Arm Stick Cylinder application |
| Replaces OEM Part No. |
JCB 991-00012 |
Direct OEM replacement |
| Primary Rod Seal |
Multi-lip HNBR compound |
Enhanced heat and pressure resistance for swing applications |
| Piston Seal System |
Polyurethane with integrated guide |
Optimized for combined rotation and linear movement |
| Wiper/Scraper |
Polyurethane double-lip with dust ring |
Maximum protection in gritty environments |
| Wear Bands/Guide Rings |
PTFE-filled composite |
Low friction under combined loads and rotational stresses |
| Rotary Seals |
Specialized rotary shaft seals |
Designed specifically for swing cylinder rotation |
| Static Seals |
High-grade Nitrile (NBR) |
Reliable sealing under vibration and pressure variations |
| Temperature Range |
-30C to +105C (-22F to +221F) |
Stable performance across operational range |
| Pressure Rating |
Up to 38 MPa (5500 PSI) |
Meets JCB swing cylinder pressure requirements |
| Rotational Speed |
Up to 30 RPM |
Rated for typical swing cylinder rotational speeds |
| Fluid Compatibility |
Mineral-based and synthetic hydraulic oils |
JDB J20C and equivalent specifications |
Parts list
| NO |
Number |
Name |
Qty |
|
559/29300 |
Ram lift |
|
| 1 |
559/37200 |
Ram lift L. H
Winterised machines only |
1 |
| 2 |
:559/29400 |
Cylinder ram |
1 |
| 3 |
::656/00435 |
Pipe piston side |
1 |
| 3 |
::559/30200 |
Pipe feed rod side |
1 |
| 4 |
::656/00496 |
Pipe feed rod side |
1 |
| 5 |
:808/00183 |
Bush bearing |
2 |
| 6 |
:559/ 15000 |
Rod assembly piston |
1 |
| 7 |
:1450/ 1001 |
Nipple grease 90deg. angle |
1 |
| 8 |
:2411/7611 |
Ring bearing 100mm cyl I.D. |
2 |
| 9 |
:2411/7511 |
Seal piston head 100mm cyl I.D. |
1 |
| 10 |
:559/ 14701 |
Head piston |
1 |
| 10 |
:595/ 10005 |
Head piston |
1 |
| 11 |
:559/ 10901 |
Gland bearing |
1 |
| 12 |
:2411/5208 |
Seal gland 60mm piston rod |
1 |
| 12 |
:2411/0408 |
Seal gland 60mm piston rod |
1 |
| 12 |
2411/0408C |
Seal gland
Winterised machines only |
1 |
| 12A |
2411/7708 |
Ring spacer 60mm piston |
1 |
| 13 |
:2407/0321 |
O Ring |
1 |
| 14 |
:559/04503 |
Cap end |
1 |
| 14 |
594/00005 |
Cap end |
1 |
| 15 |
:2411/8308 |
Seal wiper 60mm piston rod |
1 |
| 15 |
2411/8408 |
Seal wiper |
1 |
| 16 |
:559/00106 |
Circlip |
1 |
| 17 |
:1403/0001 |
Washer Aluminium |
1 |
| 18 |
:2400/0218 |
O Ring |
1 |
| 22 |
991/00012 |
Kit-seal ram 60mm rod x 100mm cyl |
1 |
Completely depressurize hydraulic system and secure all hydraulic functions
Stabilize machine on level ground with boom properly supported
Implement comprehensive lockout-tagout procedures
Wear appropriate PPE including hydraulic fluid protection
Professional Installation Procedure:
Pre-Installation Preparation:
Thoroughly clean cylinder exterior and connection points
Establish clean, organized work environment
Verify complete kit contents against component checklist
Document existing cylinder condition and configuration
System Disassembly:
Mark component orientation for precise reassembly
Photograph seal positions and directional orientations
Use specialized tools for seal removal without surface damage
Maintain strict contamination control throughout process
Component Inspection & Validation:
Inspect rod surface for wear, scoring, or corrosion
Check cylinder bore for damage or irregularities
Examine gland and piston components for wear patterns
Verify all surfaces are clean and damage-free
Precision Seal Installation:
Liberally lubricate all seals with clean hydraulic fluid
Use certified seal installation tools only
Ensure correct directional orientation of all dynamic seals
Verify complete and proper seating in all grooves
Reassembly & Performance Verification:
Reassemble following documented orientation marks
Apply manufacturer-specified torque sequences
Conduct initial cycling without load to seat seals
Perform comprehensive leak and function testing
Frequently Asked QuestionsA. When will get the items after I place order?
Q. Once your payment is confirmed,we will arrange the goods within 1~4 days; if not in stock, we will inform you before placing the order?
A. If I only know the excavator model, but can not offer parts No.,what should I do ?
Q. If possible, you can send us pictures of old products, nameplate or the size for reference.
A. How can you guarantee the quality??
Q. We will 100% test the goods before delivery. We also support video inspection.
A. How long will it take to delivery to my address??
Q. The normal delivery time is 3-7 days, depending on which country you are in.?
A : Which delivery method will you choose?
Q : By sea, air or express(DHL,Fedex,TNT, UPS, EMS etc.)，Sometimes we will arrange as the customer's demand.
A: What's package? Can you give me the package according my requirement??
Q. We usually packed by standard exported box or carton. And yes we can pack as per your requirement.
A: Can the price be cheaper?
Q: Of course, you will be offered a good discount for a big amount.
A: Why should I choose to buy from you?
Q:Our advantages: 100% quality assurance, develop and manufature follow original ones;Quick response within 24 hours; Small order allowed;Reasonable stock and timely delivery;Neutral packing, customized packing are allowed. Positive customer feedback from abroad market;Excellent after-sales service.
A : Which payment terms can you accept?
Q : Paypal. Western Union, Bank Transfer, T/T...
