Murphy Rack Puller RP75 Installation Instructions

Rack Puller for Diesel Engines
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
Side View
Reset Knob
and Stem
3-1/4 in.
(83 mm)
10-1/4 in.
(260 mm)
Rear View
Mounting
Studs
1/4-20
®
(4 places)
3-3/4 in.
(95 mm)
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
How to Order
Specify model number.
Wiring
Terminals
5-1/2 in.
(140 mm)
Mounting Hole
Dimensions
Service Parts
Specify part number.
2-3/8 in.
Part Number
(60 mm)
40-00-0021
40-00-0044
40-01-0050
40-01-0053
1-1/4 in.
(32 mm)
40-01-0054
40-05-0136
40-05-0149
80-04-1030
40-00-0024
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
Catalog Section 40
RP75 – ____ – ____
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)
Description
12 VDC core assembly
Shaft solenoid assembly
Bushing shaft assembly
Case repair kit
Cocking rod, bushing and
knob repair kit
Spring, main actuating
Spring, cocking rod return
2 Screws, machined #10-24
x 3/8 pan HD steel CAD II
24 VDC core assembly
RP-95028B/N
Revised 09-07
(00-02-0106)
®