Johnston VM502, Maintenance Manual

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V Range 502
l
652
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802 Maintenance Manual
MA9:4
Chapter - Service Tools
Introduction
The purpose of this chapter is to provide guidance and set-up data for commissioning the
hydrostatic transmission components associated with the Johnston HydroDrive system. The data
is specific to truck mounted sweepers together with Sauer Sundstrand transmission equipment and
the Johnston JVM control system.
It is presumed that the selection of the chassis and its characteristics along with the HydroDrive
system would have already been predetermined and installed to the relative guidelines. This Chapter
only gives details on the set-up and adjustments required to the hydrostatic pump and motor together
with associated components.
Initial Set-up Procedures
When starting the chassis engine and engaging the Hydrostatic gearbox for the first time from a ‘dry-
start’ for commissioning and set-up, the following procedures must be adhered to;-
1. Jack-up the rear wheels and secure on axle stands and fully chock both front wheels.
2. Fill hydraulic reservoir to the middle of the sight glass with Shell Tellus T46 oil or equivalent.
Note : Hopper resting on prop.
3. Remove the top cap of the boost canister and fill with filtered oil. When the canister is full some of
the oil will drain into the pumps, at the same time displacing air, so the canister will require topping-
up several times. It may take some time before the oil in the canister maintains its correct level (i.e.
covering the filter) at which time the top can be replaced and tightened.
4. Attach a suitable 0-25 bar gauge via an extension tube to the test point T4 , refer to section 23 of the
Technical Manual for test point location.
5. With chassis gearbox in neutral, start chassis engine to ensure air pressure is present (7.5 bar) 108
PSI.
WARNING:
Suitably guard/fence off the machine to ensure no personnel can inadvertently walk into the
revolving rear wheels.