TROUBLESHOOTING AND CORRECTIVE MAINTENANCE
3-31
Steering Counterbalance Valve
The steering counterbalance valve manifold is located
under the front plastic gear cover.
The following procedure explains how to replace the
steering counterbalance valve manifold should a sluggish
or sticking valve cartridge be suspect.
IMPORTANT
If you remove the manifold from the truck for
servicing (hex head screws and hardware), when
reinstalling the manifold be certain to tighten the
mounting screws in a staggered fashion while
applying equal pressure to all screws. If the screws
are not tightened and torqued evenly, you could
create a stress crack, thus internal oil leaks,
rendering the manifold defective.
1.
First, review “
Before You Begin,” page 1-1.
2.
Set the key switch to “OFF” and remove the key from
the ignItion switch.
3.
Apply the parking brake, disconnect the battery and
block the wheels.
4.
Relieve pressure in the system by turning the
steering wheel two times to the left, then two times to
the right and move the control levers in both
directions.
5.
Remove the plastic gear cover.
6.
Disconnect tubing at the adapters and immediately
plug/cap all lines. Have shop rags handy to manage
spills.
7.
Remove the adapters from the defective manifold
and note their alignment, then remove the mounting
hardware (5/16-18) and replace the manifold.
8.
Clean the mating surfaces of the valve spools and
make sure the O-ring seal is properly seated before
sealing the parts together.
9.
When installing fittings, apply a light film of oil to the
O-ring seal and do not overtighten. Excessive
pressure could damage the seals.
10. Install manifold - see “IMPORTANT NOTE,” on
previous page.
11. Reassemble in reverse order.
12. Before placing the truck back into operation, test it to
make sure all functions are operating properly and
that there are no oil leaks.
Hydraulic Control Valve
Assembly
General
Individual directional control pressure valve assemblies
and gauge ports (for psi readings) are located on the
hydraulic control valve or the steering control valve
manifolds. The hydraulic control valve manifold is located
in front of the drivers arm rest, under the control levers.
See Figure 3-22.
The following procedure explains how to replace a
specific valve should a sluggish or sticking valve spool be
suspect.
IMPORTANT
If you remove the valve from the truck for servicing
(hex head screws and hardware), when reinstalling
the valve be certain to tighten the mounting screws
in a staggered fashion while applying equal pressure
to all screws. If the screws are not tightened and
torqued evenly, you could create a stress crack, thus
internal oil leaks, rendering the valve defective.
The main hydraulic pump for lift, tilt and shift (mast
functions) is a single cavity pump (5 gpm). System
pressure varies from 2,650 psi, ±65 psi (18 MPa, ±0.45
MPa) minimum, up to 3,000 psi, ±65 psi (21 MPa, ±0.45
MPa) maximum. Actual pressure is determined by mast
size, load requirements and lift speed.
• Check with your Landoll service representative for
actual settings.
• The main pump pressure relief valve is located in the
hydraulic control valve, which is located beneath the
control valve cover, in front of the driver’s arm rest.
See Figure 3-22.
• A pressure gauge port is provided, with a
“quick-coupler,” Pressure Service Kit, Landoll p/n:
0018152, for reading the main pump pressure. See
Figure 3-4
NOTE
Before you service this valve for possible pressure
problems, make sure there are no leaks in the hydraulic
system and that there is sufficient oil in the tank. Both
conditions can contribute to low pressure problems. Also
hydraulic oil should be at warm operating temperature.
Also see "Mast Systems," in the Bendi B40i4 Operator's
Manual F-580 for additional circuit information.
Summary of Contents for Bendi B40i4
Page 2: ......
Page 26: ...1 20 F 581 R1 INTRODUCTION SAFETY AND INSPECTION...
Page 100: ...3 52 F 581 R1 TROUBLESHOOTING AND CORRECTIVE MAINTENANCE...
Page 120: ...4 20 F 581 R1 CALIBRATION AND PROGRAMMING...
Page 129: ...ENGINE WITH FUEL SYSTEM 5 9 Figure 5 10 Fuel System Troubleshooting...
Page 133: ...ENGINE WITH FUEL SYSTEM 5 13...
Page 134: ...5 14 F 581 R1 ENGINE WITH FUEL SYSTEM...
Page 140: ...6 2 F 581 R1 GM ENGINE SUPPLIER PROVIDED DOCUMENTATION...