Hitachi Select Parts

for Cylinder OverhaulSEAL KIT

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HSP Seal Kit for Cylinder OverhaulList of Parts Number for Each Applicable Model

On Sale of Seal Kit for Cylinder Overhaul

Applicable Machine Models Cylinder Type Parts No.

ZX110ZX110-3

For ARM YA00009241PS

For BOOM YA00009239PS

For BUCKET YA00009238PS

ZX120 For ARM YA00001393PS

ZX120-3 For ARM YA00001395PS

ZX120ZX120-3

For BOOM YA00009240PS

For BUCKET YA00011420PS

ZX200 For ARM YA00001402PS

ZX200-3 For ARM YA00001400PS

ZX200ZX200-3

For BOOM YA00001396PS

For BUCKET YA00001392PS

ZX230 For ARM 4631062PS

ZX240-3 For ARM YA00006591PS

ZX230ZX240-3

For BOOM YA00006590PS

For BUCKET YA00006592PS

ZX330-3

For ARM YA00006597PS

For BOOM YA00006596PS

For BUCKET YA00001398PS

ZX450

For ARM 4340621PS

For BOOM 4340620PS

For BUCKET 4438681PS

ZX450-3

For ARM 4653041PS

For BOOM 4653040PS

For BUCKET 4653042PS

The Seal Kit offered in this brochure is sold under the warranty comparable to the

Hitachi genuine parts warranty.

Please contact the nearest authorized Hitachi dealer for precise advice on a product or

maintenance service.

Seal Kits for other machine models are planned to be sold in sequence.

www.hitachi-c-m.com KP-EN005 12. 06(CMC)

These speci� cations are subject to change without notice.

Printed in xxxxxxx

1 Preventing oil leak The cylinder seal prevents oil leakage of a cylinder. Oil leakage through a deteriorated seal may

cause various troubles.

2 Preventing impurity intrusion The cylinder seal prevents the intrusion of dust and moisture from the outside. Intrusion of

impurities into the hydraulic line may adversely affect other hydraulic devices including pumps, cylinders, and motors by causing scoring, abnormal wear and other problems.

3 Maintenance of pressure The cylinder seal maintains pressure inside a cylinder. Low pressure inside a cylinder caused by a

damaged seal lowers the front speed and digging force.

When seal deterioration or oil leakage is detected, early replacement of the seal is recommended. Be certain to use cylinder seals made of Hitachi to maintain high machine performance when cylinder seals are replaced.

Roles of Cylinder Seal

Features of Hitachi Select Parts (HSP) Seal Kit

Cumulative working distance (km)

Leakage of large amount of oil

100500

0.02

0.04

0.06

0.08

150 200 250

Amou

nt o

f oil

leak

age

(cc/

100

m)

JIS* Standard

Life about 5 times longer

0 Cracks

Crack

Chipping

Extrusion

Rupture

Rod seal Rod seal

Rupture is occured to the buffer ring that mitigates pressure inside a cylinder.

After operation for 250 km, damage was con� ned to small cracks.

A crack or other prominent damage is occured early to the rod seal that prevents oil leakage.

No change was shown after operation for 250 km, about 5 times of the working distance of an imitation seal and oil leakage was prevented.

No deterioration is detected with a dust seal that prevents intrusion of impurities after operation of 43 km.

No change was shown after operation for 250 km and intrusion of impurities was prevented.

Buffer ring Buffer ring

Dust seal Dust seal

* Seals contained in the kit differ depending on the applicable machine model.* A cylinder hose and O-ring for pipe connection are not included in the seal kit.* In case of any deterioration of seals that are not contained in the kit is found, please separately make a purchase of

the corresponding seals, and replace them as early as possible.

Pressure: 0 to 42 MPaHydraulic temperature: 120 °COperation speed: 400 mm/sStroke: 1,000 mmHydraulic oil: Hitachi genuine hydraulic oil 46HN

* The foregoing test results vary depending on the operating ambience and frequency of machine use.

* Imitation seals do not necessarily produce test results shown above.

*JIS (Japanese Industrial Standards)

Imitation product HSP rod seal Imitation product HSP rod seal Imitation product HSP rod seal0

20

40

60

80

Pres

sure

(MPa

)

0

20

40

60

Tens

ile s

tren

gth

(MPa

)

34 MPa

0

20

40

60

80

100

120

Tem

pera

ture

(°C)

21

70

20.5

47.6 100

120

YOUR NEXT SELECTION

Hitachi Select Parts

SEAL KITfor Cylinder Overhaul

High performance is demanded for hydraulic cylinders that are directly coupled to the digging force of

a machine and that drive an arm, boom and bucket. In recent years, hydraulic pressure in cylinders has

tended to become high, and many seal parts are used in cylinders to seal high hydraulic pressure.

Hitachi has uniquely developed a seal package that features a high durability, matching the characteristics

of hydraulic systems of Hitachi products.

Test conditions

What are Hitachi Select Parts?

Hitachi Select Parts have been developed for the purposes of supplying the high-quality parts exclusively for Hitachi

products to its customers at reasonable prices. Hitachi Select Parts are available from a versatile lineup suiting the

type and operating conditions of machines. Hitachi Select Parts are sold under the warranty comparable to the Hitachi

genuine parts warranty for additional protections.

Hitachi select parts seal kit comes with following types of seals.EXAMPLE FOR ARM CYLINDER OF ZX200-3

Cannot withstand pressure inside a cylinder.

Withstands pressure more than twice the pressure applied inside a cylinder.

Pressure applied inside a cylinder of Hitachi machine (Example: ZX200-3)

HSP seal resists heat about 20 oC higher than the heat-resistance temperature of the imitation seal.

DUST SEAL

ROD SEAL

O-RING

BUFFER RING

CUSHION SEAL

BACKUP RING

SEAL RING

BACKUP RING

CUSHION SEAL

Imitation productHSP Seal Kit

Strength of HSP seal is about twice that of an imitation seal.

Almost no leakage after 250 km

A large amount of oil leaked after 43 km.

Imitation product HSP Seal Kit

Short life!

Long life!

After cumulative operation of 43 kmAfter cumulative operation of 250 km

(After operation about 5 times longer than with imitation seal)

Result of deterioration durability comparison test (heating and cylinder stroke tests) (In-house comparison)

Results of performance comparison tests of rod seal (In-house comparison)

Tensile strength Resistance to heat

Resistance to pressure

1 High-quality materialsThe materials of high durability and resistance to pressure and heat are used for HSP Seal Kit. Imitation seals are low in resistance to pressure and heat, and cannot exhibit adequate performance inside cylinders of Hitachi machines.

2 Extremely high durabilityComparison test of deterioration durability of HSP Seal Kit and imitation seal was conducted. As the result, the imitation seal caused a large amount of oil leakage due to ruptures and cracks of the seal at an early stage. HSP Seal Kit did not produce major ruptures or cracks that lead to oil leakage even though seals are used for approximately 5-fold test hours compared with imitation seals. HSP Seal Kit features a 5-fold longer life compared with imitation seals.

Long life through high durability and resistance to pressure and heat