GROVE 7-21
CD3340B/YB4411 TRANSMISSION AND TORQUE CONVERTER
Published 04/07/2015 Control # 569-00
1. The speed sensor is inoperable (Check speed sensor
and installation.
2. Shift control switch contact or wiring problems.
Erratic / Sticking Gears
It is possible that a mechanical issue is the cause of this
problem. A known problem is if the transmission has at some
point suffered coolant failure and water has entered the
transmission. If the original plastic clutch pistons are still
being used then there is a risk that they will stick.
TESTING
Solenoid Identification
When Testing Individual Clutch Pressures (It Is necessary to
isolate the clutch being tested. For instance, to check the
layshaft clutch, you could select 1st gear forward. This would
energize the layshaft and forward low clutches. Because we
only want to check the layshaft clutch pressure and not the
forward low clutch pressure, remove the electrical connector
to the forward low clutch BEFORE selecting 1
st gear.
Use the Tables 5-3 and 5-4 to determine which solenoid
electrical connectors should be removed when pressure-
testing individual clutches. Table 5-3 identifies the solenoid
connectors (see Figure 7-12) and Table 5-4 identifies which
clutches are engaged when the various gears are selected.
Table 5-3
Solenoid Description
Table 5-4
Solenoid Valve Energizing Sequence
Test For Clutch Leakage
Isolating a Suspect Clutch
Stop the engine, connect a 0-2040 kPa (0-300 psi) pressure
gauge to the test connector A, Figure 7-13 (mainline
pressure test point).
Make sure that both sides of all four wheels are chocked.
Apply the foot brake and the parking brake.
Start the engine and run at 1000 rpm. Engage1
st gear
forward. Record the pressure reading. Repeat the test for all
gear ratios in forward drive and record the pressure readings
as shown below.
Readings should not vary between clutches by more than 69
kPa (10 psi). In the example shown, we can see that
pressure is low when 2
nd and 4th gear forward is selected,
indicating clutch leakage.
From the example you can see that the forward clutch high is
used for selection of both 2
nd and 4th gear forward. We know
from the table that the mainshaft and the layshaft clutches
FIGURE 7-12
a0248
RH
MS
FL
RL
LS
FH
Item Solenoid Description
RL
RH
LS
MS
FH
FL
Reverse Low
Reverse High
Layshaft
Mainshaft
Forward High
Forward Low
Gear Direction Clutches Engaged Solenoids
First
Second
Third
Fourth
First
Second
Third
Fourth
Reverse
Reverse
Reverse
Reverse
Forward
Forward
Forward
Forward
Reverse Low & Layshaft, RL &LS
Reverse High & Layshaft RH & LS
Reverse Low & Mainshaft RL & MS
Reverse High & Mainshaft RH & MS
Forward Low & Layshaft FL & LS
Forward High & Layshaft FH & LS
Forward Low & Mainshaft FL & MS
Forward High & Mainshaft FH & MS
WARNING
DO NOT go under the crane with the engine running. Turn
off the engine, apply the parking brake, chock the wheels
and remove the ignition key before going underneath the
crane.
Reference Only
To Next Page
Loading...
Need help?
General
