Murphy Automobile Parts RP75 User Manual

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  
Dimensions  
How to Order  
The RP75 rack puller is a semi-automatic device  
that provides a pulling force to initiate shutdown  
of diesel engines and equipment.  
Specify model number.  
Side View  
Wiring  
Terminals  
Reset Knob  
and Stem  
RP75 – ____ – ____  
Voltage  
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  
12 = 12 VDC  
24 = 24 VDC  
Calibration  
3-1/4 in.  
(83 mm)  
5-1/2 in.  
(140 mm)  
Blank = 4 ft. (1.2 m) cable  
8 = 8 ft. (2.4 m) cable  
®
the SWICHGAGE detects a malfunction, the  
10-1/4 in.  
(260 mm)  
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).  
12 = 12 ft. (3.7 m) cable  
C = Chain 30 in. (762 mm)  
Rear View  
Mounting Hole  
Dimensions  
Service Parts  
Mounting  
Studs  
Specify part number.  
The RP75 is available for 12 or 24 VDC applica-  
2-3/8 in.  
(60 mm)  
1/4-20  
Part Number  
40-00-0021  
40-00-0044  
40-01-0050  
40-01-0053  
40-01-0054  
Description  
®
tions and is compatible with all SWICHGAGE  
(4 places)  
12 VDC core assembly  
Shaft solenoid assembly  
Bushing shaft assembly  
Case repair kit  
instruments.  
Specifications  
3-3/4 in.  
(95 mm)  
1-1/4 in.  
(32 mm)  
Operating Force: 30 lbf (133 N) maximum,  
Cocking rod, bushing and  
knob repair kit  
10 lbf (44 N) minimum.  
40-05-0136  
40-05-0149  
80-04-1030  
Spring, main actuating  
Spring, cocking rod return  
2 Screws, machined #10-24  
x 3/8 pan HD steel CAD II  
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  
40-00-0024  
24 VDC core assembly  
Cable: 4ft. (1.22 m); Optional 8 ft. (2.43 m)  
or 12 ft. (3.65 m) available.  
Chain (optional): 30 in. (762 mm).  
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  
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).  
 

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