INTRODUCTION
SECTION I
days after contract award and furnish same to said Mainte-
drumshafts do not turn the drums or the swing gear until
nance Directorate.
the proper clutch is engaged by the operator.
A synopsis or simplified summary of the warranty coverage
The engine drives a hydraulic control pump which provides
and its implementation will be impaired on a decalcomania
hydraulic power to the control valves in the operator's cab.
approximately 3" x 4" and shall be mounted in view of the
When the operator engages the controls in the operator's
operator as near as possible to the center of the instrument
cab, the control valves direct fluid to their respective clutch,
panel of each vehicle. On those vehicles requiring con-
brake and pawl. Also the control pump supplies hydraulic
cealed markings and registration numbers, said decalco-
oil to the crawler extension/retraction valves mounted on
mania shall be placed in a readable position on the engine
the carbody. These valvesdirect oil to the side frame exten-
side of the firewall.
sion cylinders.
The rights and remedies of the Government provided in this
clause are in addition to and do not limit any rights afforded
to the Government by any other clause in the contract.
This crane is a friction and hydraulic machine. All upper
DESCRIPTION
work functions are performed by friction clutches and
brakes. Hydraulic cylinders are used to apply the clutches
The engine serves as the power source for the upper work
and planetary brakes. The drum, swing and boom hoist
functions and the lower propel drive system. Power is
brakes are released by hydraulic cylinders working against
transmitted through the clutch and torque converter into
the brakes' spring actuators.
the worm shaft (see Figure 1-2) The worm shaft drives the
boom hoist shaft which is coupled to the swing shafts and
A pump drive, mounted at the rear of the upper, is driven di-
main drum shafts by a pair of chains. Consequently, the
rectly by the engine. Two variable displacement pumps are
boom hoist shaft, main shaft and swing shaft turn at all)
mounted on and driven by the pump drive.
times when the engine clutch IS engaged. However, the
Figure 1-2. Mechanical Train Schematic
