
Reference
Only
INTRODUCTION
18000 SERIVCE/MAINTENANCE MANUAL
1-78
Published 12-05-17, Control # 035-23
CRAWLER PIN CYLINDERS
Crawler Pin Cylinders
for the following procedure.
Crawler pin cylinder operation is controlled with hydraulic
valve handles on the front of lowerworks and programming.
Operation of both sets of pin cylinders is similar. The
following description of operation is for left side set of crawler
pin cylinders.
The accessory pump is the hydraulic pressure source to
operate crawler pin cylinders. The accessory system
proportional relief valve is controlled by node-5 controller.
The high pressure accessory system pressure is monitored
by a pressure sender. During normal operation the
proportional relief valve is set at approximately 150 psi (10
bar). Excess supply flow from fixed displacement accessory
pump is dumped through valve to tank.
When a component of accessory system is enabled, an input
signal is sent to node-1 controller. Node-5 controller sends a
variable 0 to 24 volt signal to accessory system proportional
relief valve solenoid to increase the relief valve setting to
approximately 3,000 psi (207 bar). The high pressure
accessory systems pressure increases to operate selected
component. Node-1 controller monitors system pressure.
Pull crawler pin handle down to engage crawler pins into
crawler track frame. This shifts selected crawler pins lower
accessory valve to block supply through valve and opens
supply port to cylinders.
Hydraulic fluid enters piston end of cylinder, extending
cylinder rod, pushing pins to secure crawler frame to
lowerworks. Hydraulic fluid from rod end of crawler pin
cylinder flows through lower accessory valve and is returned
to tank.
When crawler pin handle is moved back to center position,
the selected crawler pin valve shifts to center position and
opens line to cylinders.
Push selected crawler pin handle up to disengage crawler
pins from crawler track frame. This shifts selected crawler
pins lower accessory valve to block supply through valve and
opens supply port to cylinders.
Hydraulic fluid enters rod end of cylinders, retracting cylinder
rods, pulling pins to disengage crawler frame from
lowerworks. Hydraulic fluid from piston end of crawler pin
cylinders flows through lower accessory valve and is
returned to tank.
When crawler pin handle is moved back to center position,
the selected crawler pin valve shifts to center position and
opens line to cylinders.
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