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JLG G12-55A Service Manual User Manual

Page 124

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Hydraulic System

8-8

G10-55A, G12-55A

b. Pressure Specifications

S/N 0160037877 & After

Hydraulic Circuit

Test Port

Function Used to

Test

Adjustment

Location

Pressure Range

Main

P1 (A)

Bottom Tilt Down

1

3625-3700 psi

(250-255 Bar)

Pilot

JS1 (B)

No Function

2

500-550 psi

(34-38 Bar)

Standby

P1 (A)

No Function

3

750-775 psi

(52-53 Bar)

Service Brake

Supply

BV1 (C)

Bottom Steering,

Any Mode

4

1050-1150 psi

(72-79 Bar)

Steering

GLS (D)

Bottom Steering,

Any Mode

5

2450-2550 psi

(169-176 Bar)

Load Sense

LS2 (E)

Bottom Tilt Down

6

3350-3450 psi

(231-238 Bar)

Boom Extend

LS2 (E)

Bottom Boom

Extend

7

3300-3400 psi

(227-234 Bar)

Boom Retract

LS2 (E)

Bottom Boom

Retract

8

3300-3400 psi

(227-234 Bar)

Lift

LS2 (E)

Bottom Lift Down

9

3300-3400 psi

(227-234 Bar)

Auxiliary Hydraulic

LS2 (E)

Bottom Auxiliary

Function

No Adjustment

3175-3325 psi

(219-229 Bar)

MY1831

2

3

1

4

A

B

C

D

E

HYDRAULIC

MANIFOLD

MY4360

8

5

6

7

9

MAIN CONTROL VALVE

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