COGENG 991/00015 991/00016 Hydraulic Cylinder Seal Kit JCB

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COGENG 991/00015 991/00016 JCB Equivalent Hydraulic Cylinder Seal Kit

Name: COGENG 991/00015 991/00016 JCB Equivalent Hydraulic Cylinder Seal Kit
Brand: Excavator Solenoid Valve | Excavator Pressure Switch | Excavator Revol
Availability: InStock
Rating: 5 (1 reviews)

Product name: JCB Cylinder Seal Kit
Part No:991/00015 991/00016 991-00015 99100015 991-00016 99100016
Size：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 Cylinders
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

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Desciption

PRODUCT IDENTIFICATION

Parameter	991/00015	991/00016
COGENG Part Number	991/00015 (99100015)	991/00016 (99100016)
OEM Equivalent	JCB 991/00015	JCB 991/00016
Product Type	Hydraulic Cylinder Seal Kit	Hydraulic Cylinder Seal Kit
Application	Boom / Arm / Bucket cylinders	Boom / Arm / Bucket cylinders
Kit Type	Complete overhaul seal kit	Complete overhaul seal kit
Compatible Models	Multiple JCB excavator and backhoe loader models	Multiple JCB excavator and backhoe loader models

CROSS REFERENCE GUIDE

Brand	991/00015	991/00016
COGENG	991/00015, 99100015	991/00016, 99100016
JCB	991/00015, 99100015	991/00016, 99100016
Interchange	991/00012, 991/00145, 991/00147	991/00017, 991/00146, 991/00148

Decompose pictures

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
4	:576/00300	Rod piston	1
5	:1208/0015	Bush Spring	1
6	:556/01501	Cap end	1
6	:576/00402	Cap end	1
7	:556/01502	Gland bearing	1
7	:576/00401	Gland bearing	1
8	:556/00101	Head piston	1
8	:576/00101	Head piston	1
9	:1450/0001	Nipple Grease, Straight 1/8 BSP	1
9	: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
12	991/00016	Kit-seal ram 50mm rod x 80mm cyl	1

Installation decomposition diagram
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 Questions
Q: Is this seal kit suitable for professional hydraulic cylinder rebuilding?
A: Yes, COGENG 991/00015 and 991/00016 equivalent seal kits are manufactured using high-grade polyurethane, nitrile, and PTFE materials to precise OEM dimensional specifications. They are designed for professional cylinder rebuilding and provide reliable sealing performance when installed following standard hydraulic cylinder repair procedures by a qualified technician.
Q: What is the warranty coverage for these seal kits?
A: COGENG provides a standard 12-month warranty against manufacturing defects from the date of installation. Proof of purchase and installation by a qualified technician are required. Warranty does not cover seal failure caused by contaminated hydraulic fluid, improper installation, cylinder barrel or rod surface damage, or use on incompatible equipment.
Q: What should I inspect before installing the new seal kit?
A: Before installation, carefully inspect the cylinder rod for scratches, pitting, or chrome plating damage, and check the cylinder barrel for scoring or internal wear. Damaged surfaces will cause premature seal failure. Recondition or replace worn components and thoroughly flush the hydraulic system to remove all contaminants before reassembly.

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About us: Welcome to the official website of GAOGENG(COGENG) has their own high-quality mining machinery components famous factory . We specialize in the production and distribution of top-notch products such as Excavator Solenoid Valve, Pressure Switch, Revolution Sensor, Wiring Harness, Throttle Motor, Oil Pressure Switch, and Water Temp Sensor, specifically designed for renowned brands in the mining industry:
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