Lull 6K Service Manual - Manual (Page 550)

Transmission
8-2 Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
3. 3- or 4-Speed Transmission
a. 38369A — 3-Speed Transmission
b. 38370A — 4-Speed Transmission
The 3- and 4-speed transmission consists of a torque converter
coupled to a multi-speed powershift transmission with an integrated
transfer case. The 3-speed design has three forward and three reverse
speeds. The 4-speed design has four forward and three reverse
speeds. Speed ranges and direction can be engaged and disengaged
under load with hydraulically-actuated multidisc clutches.
4. ZF Cable Harness
a. P31566 — Used with 3- and 4-speed transmissions which employ
an EST-19 Microprocessor Control Unit
The ZF cable harness adapts the vehicle’s power supply to the ZF
transmission system and completes the electrical connections
between the EST-19 microprocessor, shifter, transmission valve
assembly, and the inductive transmitter.
5. Inductive Sensor
a. P32077 — Sensor used with 3- or 4-speed transmissions which
employ an EST-19 Microprocessor Control Unit
The inductive sensor is a pulse transmitter. Its function is to protect the
transmission and engine from over-speeding or over-revving caused
by sudden downshifting or high-speed reversals by transmitting input
frequency signals which equate ground speed to the microprocessor.
6. Vehicle Electrical System
The ZF transmission will not operate without an uninterrupted 12 volt
power supply. The recommended continuous operating voltage is
10.5–16.5 volts. Intermittent voltage, low voltage, or voltage exceeding
16.5 may cause the EST-19 to shut down until voltage is stabilized
within recommended parameters.
ZF Transmission with DW-3 Shifter
6K-37 (S/N 398–)
6K-42 (S/N 132–)
644B-37 (S/N 881–)
644B-42 (S/N 242–)
8K-42 (S/N 262–)
844C-42 (S/N 784–)
10K-42 (S/N 108–)
10K-54 (S/N 108, 110–)
1044C-42 (S/N 122–)
1044C-54 (S/N 216–) The ZF transmission system that uses a DW-3 shifter contains the
following four components:
1. DW-3 Speed Range/Direction Selector (Part Number 65014B)
The column-mounted shifter consists of a rotary switch for speed
range selection and microswitches for neutral, forward, and reverse
selection. The DW-3 shifter sends signals directly to the solenoids at
the transmission valve assembly.
2. 3- or 4-Speed WG100 Transmission
a. 38369A — 3-Speed Transmission
b. 38370A — 4-Speed Transmission