Petersen Industries, Inc.
TL Owner's Manual
Part 4: Controls
THROTTLE CONTROL
Throttle controls are installed for loaders mounted on a truck chassis. For loaders
mounted on trucks with mechanical engines, either a manual throttle or a Muncie
Hydrothrottle is installed. For loaders mounted on trucks with electronically controlled
engines, a manual switch is used to advance the engine speed. The engine speed is
advanced to the preset RPM, thus increasing the volume of oil available for loader
functions. The hydraulic system is designed for maximum oil flow of 18 gallons per
minute. This engine speed is based on the ratios of the transmission and the pto gear
and is noted below.
Exceeding preset RPM will cause excess oil flow, which may cause unsafe operating
speeds, excessive oil temperature, undue wear and tear on the loader and chassis.
Some signs of throttle control mal-adjustment or tampering are:
1. Leaking hydraulic seals caused by excess heat.
2. Prematurely worn loader components caused by excess operating speed.
3. Sticks, bricks, rocks, etc. found in the truck cab may indicate the loader operator has
purposely intended to exceed preset engine RPM by jamming the truck accelerator.
PTO OVER-SPEED CONTROL
The over-speed control is a device that disconnects the PTO or diverts the flow of oil
back to tank rather than to the loader valves.
The purpose of this control device is to prevent excess oil flow to the hydraulic system,
which could happen if the throttle control device is altered or over-ridden.
This over speed is set at 350 rpm higher than the preset rpm.
Power Take-Off Manual Transmission:
Manual Shift Control – The PTO is engaged when the knob on the dash or
floor is pulled out and disengaged when the knob is pushed in. The truck
gear shift lever must be in neutral and the clutch depressed whenever the
knob is moved.
Air Shift Control – The PTO is engaged when the switch is moved to apply
air to PTO, the “On” position. The PTO is disengaged when the switch is
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