The CARCO Power Shift Winch is a single drum unit
that mounts to the rear of a crawler tractor. It is driven
by engine power through the tractor PTO (Power Take-
Off). The winch may be operated independently or with
the tractor transmission engaged. When operated prop-
erly, it is capable of utilizing maximum engine horse-
power. The standard winch is equipped with equal
speed gearing, power-in and power-out multi-disc oil
actuated friction clutches and a spring applied, hydrauli-
cally released multi-disc oil brake.
The winch may be manufactured as a Standard (or High) PTO
or Low PTO configuration, depending on the tractor application.
In the Standard PTO configuration, the bevel gear group, clutch-
es and brake assembly are located in the upper bores of the
winch case.
The Low PTO configuration has the bevel gear group,
clutches and brake assembly located in the lower bores
of the winch case.
The 50B winches may have either a 3-shaft or 4-shaft
gear train configuration depending on the tractor horse-
power, PTO speed and winch line speed requirements
of the winch application. The 70A winches are manufac-
tured in a 4-shaft configuration, except when used in a
very limited number of special applications.
Standard and Low PTO winch configurations are avail-
able with either standard or slow speed gear ratios. The
standard speed winch is primarily used in logging, land
clearing and general utility applications. The standard
speed models have gear ratios which closely match the
cable drum rotation speed in Reel-In (forward) to the
tractor reverse track speeds for optimum advantage in
tractor recovery applications.
The slow speed winch configuration is similar to the
standard speed unit, but uses slow speed gearing for
greater load control. A slow speed winch is well suited
for oil and gas field, mining and pipeline applications.
Optional features increase the ability of the winch to
meet specific application requirements. Options avail-
able for the 50B & 70A series winches include:
• Free Spool
• Gear Ratios
• Three or Four Roller Fairleads
The winch model number is an important reference as
to the optional components included when the winch
was manufactured. The identification plate located on
the RH side of the winch contains this code, as well as
the winch serial number.
MODEL DESCRIPTION
MODEL
C 0 0 0 0 0 E
Bevel Gear
Ratio
A-1:1
B-1.27:1
C-1.64:1
D-2.11:1
E-2.79:1
50B & 70A
0-Overwind
1-Underwind
0-Standard Brake
0-Without Free Spool
1-With Free Spool
0-Four shaft winch
1-Three shaft winch
0-No fairlead
3-Three roller fairlead
4-Four roller fairlead
E-Electronic controls
The winch model number contains the following con-
figuration data:
Standard PTO Shown
Important:
Always refer to the serial number and model num-
ber when requesting information or service parts.
ID PLATE
S/N LOCATIONS
3
Summary of Contents for CARCO 50B
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