Product name: JCB Cylinder Seal KitPart No:991/00015 991/00016 991-00015 99100015 991-00016 99100016Size：40mm / 70mm Model Number:For 3DX 3C-2 3CX-4 3DS-4 4C-2 3CX , 4CX , JCB 2CX 1CXT , 406 , 407 , 408 Typical Cylinder Applications: Stabilizer/Leg Cylinders, Boom Extension Cylinders, Bucket Cylinders, Auxiliary Hydraulic Circuits, Attachment Control CylindersMaterial:Lron+RubberPacking:PP bag inside, carton box outsidePayment Terms:Western Union, L/C, T/T, MoneyGram, D/A, D/PMOQ:Acceptable trial orderShipping Mode:By air, by sea, by express(Fedex, UPS, DHL, TNT, etc.)Place of Origin:Guangdong, ChinaBrand name:COGENGCertifiCATEEion:ISO9001Supply :500PCS
| Parameter |
Specification |
Technical Notes |
| COGENG Part Number |
COGENG-991/00015-MED |
"MED" denotes medium-duty application |
| Replaces OEM Part No. |
991/00015, 991-00015, 99100015 |
Direct replacement for all listed part numbers |
| Rod Diameter |
40 mm (±0.10 mm) |
Precision-machined for perfect rod seal fit |
| Bore Diameter |
70 mm (±0.15 mm) |
Accurate sizing for optimal piston seal performance |
| Primary Rod Seal |
Multi-lip NBR with PTFE enhancement |
Superior high-pressure sealing capability |
| Primary Piston Seal |
Polyurethane (PU) composite |
Excellent extrusion resistance and durability under medium-duty loads |
| Wiper/Scraper |
Polyurethane (PU) |
Double-lipped design for maximum contaminant exclusion |
| Wear Bands/Guide Rings |
PTFE-Filled Nylon |
Low friction coefficient, prevents metal-to-metal contact |
| O-Rings & Back-up Rings |
Nitrile (NBR) |
High-quality static seals with excellent compression set resistance |
| Temperature Range |
-35°C to +110°C (-31°F to +230°F) |
Wide operating range for various climate conditions |
| Pressure Rating |
Up to 35 MPa (5000 PSI) |
Engineered for medium-duty hydraulic applications |
| Fluid Compatibility |
Mineral oils, synthetics, and biodegradable fluids |
Compatible with JDB J20C and similar specifications |
Parts list
| NO |
Number |
Name |
Qty |
| 1 |
556/03900 |
Ram
X = Early type see list below for components. |
2 |
| 556/06900 |
Ram Y = Later type see E4-1-3 for components. |
2 |
| 556/ 11800 |
Ram shovel 40mm rod x 70mm cyl |
2 |
| 556/ 18700 |
Ram shovel 40mm rod x 70mm cyl |
1 |
| 576/00600 |
Ram loader arm standard
X = Early type see list below for components |
2 |
| 576/02600 |
Ram loader arm standard
Y = Later type for components see E4-1-3 |
2 |
| 576/07500 |
Ram loader arm 50mm rod x 80mm cyl |
1 |
| 576/ 10700 |
Ram loader arm 50mm rod x 80mm cyl |
2 |
| 576/ 14100 |
Ram loader arm 50mm rod x 80mm cyl |
2 |
| 2 |
:556/04000 |
Cylinder |
1 |
| ::655/00190 |
Pipe rod side |
1 |
| ::655/00191 |
Pipe piston side |
1 |
| :576/00700 |
Cylinder standard |
1 |
| ::655/00188 |
Pipe piston side |
1 |
| ::655/00187 |
Pipe rod side |
1 |
| 3 |
:1208/0018 |
Liner Steel |
1 |
| 4 |
:556/00300 |
Rod piston |
1 |
| :576/00300 |
Rod piston |
1 |
| 5 |
:1208/0015 |
Bush Spring |
1 |
| 6 |
:556/01501 |
Cap end |
1 |
| :576/00402 |
Cap end |
1 |
| 7 |
:556/01502 |
Gland bearing |
1 |
| :576/00401 |
Gland bearing |
1 |
| 8 |
:556/00101 |
Head piston |
1 |
| :576/00101 |
Head piston |
1 |
| 9 |
:1450/0001 |
Nipple Grease, Straight 1/8 BSP |
1 |
| :1450/ 1001 |
Nipple grease 90deg. angle |
1 |
| 10 |
:1450/0001 |
Nipple Grease, Straight 1/8 BSP |
1 |
| 11 |
:1403/0001 |
Washer Aluminium |
1 |
| 12 |
:991/00015 |
Kit-seal ram 40mm rod x 70mm cyl |
1 |
| 991/00016 |
Kit-seal ram 50mm rod x 80mm cyl |
1 |
Pre-Installation Checks:
Clean the cylinder exterior and work area thoroughly.
Compare old seals with new components to verify compatibility.
Inspect the rod, bore, and gland for scratches or wear. Polish minor imperfections with fine emery cloth.
Disassembly:
Mark the gland, piston, and tube for reassembly alignment.
Document seal order and orientation with photos.
Remove old seals carefully without damaging gland or piston grooves.
Seal Installation:
Lubricate all new seals and contact surfaces with clean hydraulic fluid.
Use soft-tipped tools or seal installation kits to avoid damaging seals.
Ensure seals are seated evenly in grooves without twists or rolls.
Reassembly & Testing:
Reassemble components in reverse order of disassembly.
Torque gland nuts and bolts to manufacturer specifications.
Cycle the cylinder slowly without load to seat the seals. Check for leaks and monitor fluid levels.
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...
