HYDRAULIC SYSTEM GRT8100 SERVICE MANUAL
2-64
Published 3/26/2018, Control # 596-05
TELESCOPE AND TELE FILL STAGE
SELECT MANIFOLD VALVE
Description
The telescope and tele stage select manifold valve (see
Figure 2-35) is located inside the rear of the boom assembly
and is controlled by the crane control system. Based on the
telescope mode selected in the rated capacity limiter system
in the cab and inputs from the telescope cylinder length
sensing components (including the boom proximity
switches), the crane control system will determine whether
the first or second stage of the telescope cylinder extends or
retracts first or second. For more information about operation
of the rated capacity limiter system and the boom proximity
switches, see the Rated Capacity Limiter (RCL) System
section in the GRT8100 Operator Manual.
The telescope and tele fill stage select valve manifold, the fill
tube pressure regulating valve on the front steer/swing
brake/pilot supply/fill tube manifold valve assembly, and the
two telescope cylinder pressure transducers perform the
following functions:
• prevents the first stage (boom tele sections 2, 3, and 4)
from moving when the second stage (tele section 1)
extends or retracts by maintaining oil pressure in the fill
tube of the first stage.
• prevents the second stage from moving as the first stage
extends or retracts by maintaining oil pressure in the fill
tube of the second stage.
Maintenance
Removal
1. Tag and disconnect electrical connectors to valve.
2. Tag and disconnect hydraulic hoses from valve. Cap or
plug lines and ports.
3. Remove capscrews, lockwashers, and flatwashers
securing valve. Remove valve.
Installation
1. Secure valve with nuts, flatwashers, lockwashers, and
capscrews. Torque capscrews - refer to Fasteners and
Torque Values, page 1-15 for proper torque value.
2. Connect hydraulic hoses to ports on valve as tagged
during removal.
3. Connect electrical connectors to valve as tagged during
removal.
To Next Page
Loading...
Need help?
General
