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Murphy Rack Puller RP75 User Manual

Rack puller for diesel engines, Model rp75, Pulls injection pump or air intake shut-off lever

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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)