Grove GMK4100L Mobile Crane
by: Steven Downes
Presented here is the Grove GMK4100L 4-axle mobile crane in
1:50th scale. The upper structure is a completely new casting and
features great detailing throughout. The cab can be tilted to about
30 degrees and features a fully detailed interior with operator
seat, joystick controls and monitors all visible through the fully
glazed cab frame.
Windscreen wipers have been added to the front and roof windows
along with front mounted flood lights with painted lenses. The rear
of the upper structure has a very nicely defined couterweight block
which consists of individual plates but it is a shame that the
couterweight is not easily removable from the model as this is
something that other manufacturers have added to their models.
Unscrewing the two screws on the underside of the counterweight
base plate will release the counterweights from the carrier. Once
removed, the plates can be removed from the base holder.
It is interesting that, although the upper structure is also
used on the 5-axle GMK5115 model, the counterweight pieces are
different, showing true attention to detail. Two hook blocks are
supplied with the model with the second used when the optional
second winch assembly is installed at the rear of the
upper-structure. When not fitted, a small counterweight piece can
be inserted to cover the holes.
Also supplied are two different safety railings which fit behind
the cab. One is used for transport configuration while the other is
used when the model is posed in a working configuration.
The 7 section telescoping boom has a detailed head with a single
cast, 7 shieve pulley at the front with two single shieve pulleys
at the rear of the head and has smooth sliding extending boom
sections. The two section, swing out jib can be mounted to the side
of the boom using the supplied pins. The main part of the jib can
be removed as pictured left and the hydraulic angle adjustment
allows for close work with the main load block.
The single hydraulic cylinder that lifts the boom is much
stiffer than previous Grove cranes and again has the ability to
insert a pin through the boom to ensure it remains upright when all
the boom sections are fully extended. The shieves are metal which
is a nice addition and the model is supplied with a new hook block
already connected to the model. so it can be displayed out of the
box. The load block is different to the earlier Grove cranes and
looks much more realistic. The flexible hydraulic piping fitted to
the main lift cylinder greatly adds to the realism of the model, as
does the detailed slewing motors, textured panel surfaces and
intricate safety and warning markings.
Flexible piping has also been added to the winch motors,
travelling along the side of the upper frame. Even the
counterweight lift jacks have tiny hoses fitted. The front cab has
a fully replicated interior including seat belts and fire
extinguisher which are visible through the clear windows. The
rubber window seals have been painted on all the windows along with
textured dark grey trim on the panels below the doors with the door
handles highlighted with black paint. The front windscreen has
photo-etched wipers and there is a metal loop connected to the
chassis where the hook is secured during transport.
The top decking behind the cab is also highly detailed with
photo etched grill, large fuel tank on one side and a cooling
system on the other. There is also a chrome exhaust stack with
jacket and a warning beacon fitted to the cab roof along with a
flexible radio antenna. The side mounted rear view mirrors are
provided in the box and need fitting to the model which is easy,
although it might be a good idea to use a touch of glue to hold
them in place.
The four outriggers can be extended from the chassis and consist
of single arms with metal pads that can be lowered to raise the
model off its wheels and the screw thread is hidden so extending
the jack legs looks very realistic as if they were hydraulic
pistons. This again adds to the overall impression of realism. The
red and white chevrons look good and tiny printed safety labels
have been added, as have small white triangles on the inside of the
outriggers indicating the amount of extension.
The underside of the model features an amazing level of detail
that is not usually present on crane models from other
manufacturers, particularly as is is seldom seen when the model is
being displayed and yet TWH have gone the extra mile to fully
recreate the chassis and drivetrain to perfection. All four axles
have linked steering which allows a tighter turning radius but the
linkage prevents the model being posed in crab steer mode. Drive
shafts have been added to each of the axles and connect to the
transfer box mounted in the centre of the chassis. Air bottles and
flexible hoses have been added to the axles and each features
working suspension using small springs. Another good feature is the
centrally located integrated access ladder and intricate amber
painted side lights that have been added for a little extra
This is another great addition to the growing Grove model range
and builds on the levels of detail and realism found on the Grove
5-axle cranes. The model is supplied with a small booklet which
gives details of the full sized machine with lifting specifications
and dimensions along with an assembly guide explaining how to
assemble the mirrors and secondary winch.