Murphy Rack Puller RP75 Manuale utente

RP-95028B/N

Revised 09-07

Catalog Section 40

(00-02-0106)

Rack Puller for Diesel Engines

Model RP75

■

Pulls Injection Pump or

Air Intake Shut-off Lever

■

30 lbf (133 N) Operating Force

■

Models Available for 12 or 24 Volt Systems

■

Operates on Signal from SWICHGAGE®

Installed on the Engine or Driven Equipment

Description

The RP75 rack puller is a semi-automatic device

that provides a pulling force to initiate shutdown

of diesel engines and equipment.

The RP75 connects to the injection pump or air

intake shut-off lever via a cable (chain optional).

A coil spring, within the RP75, is reset manually

and is held in place by an electromagnet. When

the SWICHGAGE®detects a malfunction, the

electromagnetic circuit is interrupted through a

Magnetic Switch–releasing the coil spring thus

pulling the cable/chain to actuate shutdown. The

spring, when fully compressed, exerts a pull of 30

lbf (133 N).

The RP75 is available for 12 or 24 VDC applica-

tions and is compatible with all SWICHGAGE®

instruments.

Specifications

Operating Force: 30 lbf (133 N) maximum,

10 lbf (44 N) minimum.

Coil Voltage: Specify 12 or 24 VDC.

Coil Resistance: RP75-12: 32.2 ohms.

RP75-24: 129.8 ohms.

Length of Travel: 1-7/8 in. (48 mm).

Control Linkage

•

Cable: 4ft. (1.22 m); Optional 8 ft. (2.43 m)

or 12 ft. (3.65 m) available.

•

Chain (optional): 30 in. (762 mm).

NOTE: Specify options when ordering.

Shipping Weight: 5 lbs 3 oz. (2.4 kg).

Shipping Dimensions: 9-1/4 x 8-1/4 x

5-1/4 in. (235 x 210 x 133 mm).

Dimensions How to Order

Specify model number.

RP75 – ____ – ____

Service Parts

Specify part number.

Part Number Description

40-00-0021 12 VDC core assembly

40-00-0044 Shaft solenoid assembly

40-01-0050 Bushing shaft assembly

40-01-0053 Case repair kit

40-01-0054 Cocking rod, bushing and

knob repair kit

40-05-0136 Spring, main actuating

40-05-0149 Spring, cocking rod return

80-04-1030 2 Screws, machined #10-24

x 3/8 pan HD steel CAD II

40-00-0024 24 VDC core assembly

Warranty

A limited warranty on materials and workmanship

is given with this FW Murphy product. A copy of

the warranty may be viewed or printed by going to

www.fwmurphy.com/support/warranty.htm

Voltage

12 = 12 VDC

24 = 24 VDC

Calibration

Blank = 4 ft. (1.2 m) cable

8 = 8 ft. (2.4 m) cable

12 = 12 ft. (3.7 m) cable

C = Chain 30 in. (762 mm)

Reset Knob

and Stem

3-1/4 in.

(83 mm)

10-1/4 in.

(260 mm)

3-3/4 in.

(95 mm) 1-1/4 in.

(32 mm)

2-3/8 in.

(60 mm)

Wiring

Terminals

Mounting

Studs

1/4-20

(4 places)

Side View

Rear View Mounting Hole

Dimensions

5-1/2 in.

(140 mm)

RP-95028B/N page 2 of 2

Mounting

Mount the RP75 using a mounting bracket as illustrated in

Figure 1 (see page 1 of this bulletin for mounting hole dimen-

sions.). If installing the RP75 to an engine com-

partment firewall, go to Step 2.

If installing the RP75 to an engine

compartment firewall, drill a 37/64

in. (15 mm) diameter hole in the

firewall (see Figure 2).

Remove the reset knob on the RP75 by loosening the allenhead

screw on the knob.

Remove the mounting nut and insert the RP75 reset stem

through the hole from the back of the firewall.

Replace the mounting nut and tighten. Reinstall the reset knob.

Typical Wiring Diagrams

Wire the RP75 appropriately (see Figure 3). NOTE: RP75 is voltage

rated; do not apply 24 VDC to 12 VDC model and vice versa. Also,

the 117PH Magnetic Switch is rated for both 12 and 24 VDC circuits

but voltage must be specified when ordering the 518PH or 761APH

Magnetic Switches.

Installing Cable or Chain

To install the control linkage (cable or chain), apply voltage to

the RP75. Push in the reset knob. If installing the cable, insert

the cable attaching nut into the RP75 and tighten snugly (see

Figure 1). DO NOT OVERTIGHTEN or threads may strip.

Attach and tighten outer cable securing nut. If installing the

chain, attach the “S” hook to the RP75 (see Figure 1).

Attach the other end of the cable or chain to the injection pump

or air intake shut-off lever so it moves freely without sharp

bends and without binding.

Operation Test

NOTE: Some method must be provided to disconnect (lockout) all

normally closed SWICHGAGE®circuits when starting (such as

through the appropriate Magnetic Switch).

Reset magnetic switch.

Push in RP75 reset stem until coil latches the trip mechanism.

Start engine and observe that all locked out contacts clear.

With engine running, ground SWICHGAGE®contact. The

Magnetic Switch will trip thus removing voltage to RP75. The

engine should shutdown immediately. If the engine does shut-

down, adjust control linkage (cable or chain) to ensure that shut-

off lever travels the full length in both directions.

RP75

Magnetic Switch Energized to Run

SWICHGAGE®

CSBBattery

117PH

RP75

Magnetic Switch Energized to Run

SWICHGAGE®

GBSW1 SW2N.C. Battery

518PH

RP75

Time Delay On Start

SWICHGAGE®

GBSN.O. N.C. Battery

761APH

Installation Instructions

WARNING

Before beginning installation of this Murphy product:

✔✔Disconnect ALL electrical power to the machine.

✔✔Make sure the machine CANNOT operate during installation.

✔✔Follow all safety warnings of the machine manufacturer.

✔✔Read and follow all installation instructions.

Mounting

Bracket

Lockwashers

(4 required)

1/4-20 Nut

(4 required)

Wiring

Terminals

Cable

Attaching Nut

Outer Cable

Securing Nut

“S” Hook Chain

Reset Knob

and Stem

Push to Latch

Firewall

Reset

Knob

Mounting

Nut

Reset

Stem

Allenhead

Screw

Figure 1

Figure 2

Figure 3

CAUTION:Shut-off lever should not pull hard

against the stop in the “off” position.

WARNING:The

firewall must be capa-

ble of withstanding the

push and pull force of the RP75.

CONTROL SYSTEMS & SERVICES DIVISION

P.O. Box 1819

Rosenberg, Texas 77471 USA

Phone: +1 281 633 4500 Fax: +1 281 633 4588

E-mail: [email protected]

FRANK W. MURPHY, LTD

Church Rd Laverstock

Salisbury SP1 1QZ UK

Phone: +44 172 241 0055 Fax: +44 172 241 0088

E-mail: [email protected]

Web site: www.fwmurphy.co.uk

COMPUTRONIC CONTROLS, LTD

41 - 43 Railway Terrace Nechells

Birmingham B7 5NG UK

Phone: +44 121 327 8500 Fax: +44 121 327 8501

E-mail: [email protected]

Web site: www.computroniccontrols.com

FW MURPHY INSTRUMENTS (HANGZHOU) CO. LTD

77 23rd Street

Hangzhou Economic & Technological Development Area

Hangzhou, Zhejiang 310018 China

Phone: +86 571 8788 6060 Fax: +86 571 8684 8878

FW MURPHY

P.O. Box 470248

Tulsa, Oklahoma 74147 USA

+1 918 317 4100 Fax: +1 918 317 4266

E-mail: [email protected]

INDUSTRIAL PANEL DIVISION

Fax: +1 918 317 4124

E-mail: [email protected]

MURPHY POWER IGNITION

Web site: www.murphy-pi.com

www.

fwmurphy

.com Printed in U.S.A.

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