Operation - Section 30 OM3070
Page 30-14 Operating Instructions
DISABLED TRUCK OPERATION
GENERAL
Refer to the shop manual for repair and troubleshoot-
ing procedures for the hoist system components and
steering system components. Refer to the shop man-
ual for repair and troubleshooting procedures for the
hydraulic brake system components.
STEERING AND BRAKE SYSTEM
Quick disconnect fittings (1 and 2, Figure 30-5) can
be installed to allow operation of the steering and
brake circuits for temporary truck operation if the
steering/brake pump is not operational. Once these
fittings are installed, two hoses (supply and return)
must be connected to a hydraulic source (such as an
operational truck or an auxiliary power unit) to use
this feature.
Components Required
The following parts will be needed to install quick dis-
connect fittings that will allow the use of alternate
hydraulic power source.
1. Stop the truck engine and wait two minutes to
allow the hydraulic system pressure to
bleeddown.
2. Remove the plug and install the necessary QD
supply fittings listed in Table 1 into the QD
Supply port on the bleeddown manifold.
3. Remove the plug and install the necessary QD
return fittings listed in Table 2 into the QD
Return port on the bleeddown manifold.
:
4. The supply jumper hose must be equipped with
quick disconnect fitting PB4682. This will
connect to quick disconnect fitting (1).
5. The return jumper hose must be equipped with
fitting PB4684 to connect with return quick
disconnect fitting (2).
Table 1: QD Supply Fittings
Qty Part Number Description
1 PB4686 Dust Cover
1 PB4683 Disconnect Fitting
1 VN3308 Swivel Adapter
1 WB0543 Fitting
Table 2: QD Return Fittings
Qty Part Number Description
1 TA2968 Dust Cover
1 PB4685 Disconnect Fitting
1 WA3568 Swivel Adapter
1 WB0599 Fitting
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