DAF CF65, CF75, CF85 Series . Manual - part 142

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1-1

Safety instructions

CAB TILTING MECHANISM

ΧΦ65/75/85 series

1. SAFETY INSTRUCTIONS

1.1 SAFETY INSTRUCTIONS

General
The cab is equipped with a hydraulic tilting
mechanism. The pump is located on co-driver's
side at the rear of the cab. The cab locks are
opened hydraulically during pumping.

Before tilting the cab, make sure that the doors
are closed, that there are no loose items in the
cab and that the gear lever is in neutral.
Always tilt the cab fully forward if work must be
carried out underneath the cab.

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You can stop the cab tilting forward
at any time by turning the cock of the
cab tilting pump to the reverse tilting
position.

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When working on a tilted cab (for
example when welding, spray-
painting or applying bitumen
coatings), be sure to cover the
piston rod of the lifting cylinder.
Welding spatter and paint on the
piston rod will inevitably cause
damage to the oil seal.

Inspection after a collision
Before tilting the cab after a collision, check the
cab rests, the cab hinges and the attachment of
the lifting cylinder to the chassis member and cab
for cracks.

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If the vehicle has been involved in a
collision, the cab must under no
circumstances be tilted without due
precautions. The end stop in the
lifting cylinder may be damaged,
which might cause the cab to shoot
past its end stop.

If possible, suspend the cab from a hoist and
place a stand in front of the cab. Also make sure
that there is no one in front of the cab while it is
being tilted.

CAB TILTING MECHANISM

1-2

200346

Safety instructions

ΧΦ65/75/85 series

Replacing lifting cylinder:
After a collision, always check the lifting cylinder
for internal damage.
Replace the lifting cylinder if damaged or if in
doubt.
Always replace the lifting cylinder if one of the
following points has occurred during a collision:

The cab has been pulled out of the cab locks

The cab locks have been deformed or
damaged

The rear springs have been deformed or
damaged.

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General

CAB TILTING MECHANISM

ΧΦ65/75/85 series

2. GENERAL

2.1 OPERATION, TILTING MECHANISM

General
The cab is equipped with a hydraulic tilting
mechanism. The pump is located on the co-
driver's side at the rear of the cab.
The cab locks are automatically hydraulically
opened when the pump is being operated.

If the vehicle has been involved in a collision,
check the following points before tilting the cab:
-

Cab rests

Cab hinges

Attachment of the lifting cylinder

Hydraulic system for leakage.

After this check, continue to proceed with utmost
care.
If possible, suspend the cab in slings and put a
stand in front of the cab.
After a collision, always check the lifting cylinder
for internal damage.

Tilting the cab
-

Make sure there are no people immediately
in front of the cab.

Make sure there is sufficient clearance
around the cab.

Make sure there are no loose objects inside
the cab.

Apply the parking brake.

Move the gear lever to the correct position
and turn the engine off.

Close the doors.

Tilting the cab forward
-

Turn the two-way valve of the cab tilting
pump fully clockwise (A).

Position the pump actuating rod in the pump
and operate the pump.

You can stop the cab tilting forward at any
time by turning the two-way valve
counterclockwise.

Tilting back
-

Turn the two-way valve of the cab tilting
pump fully counterclockwise (B).

Position the pump actuating rod in the pump
and operate the pump.
You can stop the cab tilting back at any time
by turning the two-way valve clockwise (A).

When the cab has been fully tilted back, the
warning symbol "cab lock open" on the
master display should be extinguished.

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CAB TILTING MECHANISM

2-2

200346

General

ΧΦ65/75/85 series

Tilting the cab forward

Turn the two-way valve (2) on the pump (1)
clockwise (position A).
While pumping, pressure will build up in both
pipes leading to the lifting cylinder (3) and the cab
locks (6).
Any overpressure in the system is returned to the
reservoir via the safety valve (7).
At each pump stroke, the non-return valve (5)
opens.
Oil will now flow underneath the piston of the
lifting cylinder (3).
The pressure in the pipes drops back to zero at
the end of each pump stroke.
As a result, the non-return valve (5) closes.

In spite of the fact that the oil pressure above and
below the cylinder piston is the same, the cylinder
is pumped out, so that the cab is tilted.
This is due to the fact that the same pressure is
acting on two surfaces that are different in area.
The resulting force is the pressure in the system
which is applied to the surface of the plunger
cross section.
Once it has passed top dead centre, the cab will
fall into the full tilt position on its own.
Pumping is not necessary during this time.

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