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Howard rotavator gem, super gem workshop manual
This is a full workshop manual for the Howard Gem mk1-V and Super Gem very clean reproduction of the original, below are some excerpts from the introduction which will tell you exactly what is covered etc.
Specifications, torque loadings, special tools. A
Engine removal, clutch, clutch shaft, air cleaner. B
Main frame, handlebars, shields.
Rotor, rotor clutch, drive chain, backplate.
Lubrication, maintenance and fault finding.
This service manual has been compiled to give HOWARD Dealers and their
staff, a sequence of operations to enable the servicing and repair of a
GEM ROTAVATOR to be carried out quickly and effectively.
Because of our policy of continuous improvement, this manual should
always be used in conjunction with the latest service bulletins covering the
GEM. These service bulletins are distributed to all HOWARD horticultural
dealers when they are first printed, and back issues are available from us on
request. HOWARD GElVl service bulletins after bulletin H.63, should be
kept with this manual, and a note added to the index of each section
affected, so that an up to date record of modifications is kept.
At the start of each section, there is a list of ordinary workshop tools that
will be required when carrying out the repairs covered by that section.
Some 'special tools' may also be required, of which a complete list can be
found under 'special tools' section 'A'.
In addition to the special tools and equipment used during some repairs, a
hydraulic or hand operated fly press (of the type found in most workshops)
will be required when removing and fitting oilseals and bearings.
Before assembly of component parts, remove dirt and grease and, in the
case of new parts, remove the special rust inhibitor, otherwise the function
of the component may be restricted when in operation. When ordering
spare parts, DO NOT confuse the illustration numbers used in this manual
with the TRUE part numbers found in the official parts list, form number
The HOWARD GEM has been developed over
Since its introduction in 1942, there have been five series of GEM, each
series being an improved version of
The original GEM was fitted with 'bicycle type' handlebars, but was not
a differential or a reverse gear. Series 1 machines were
produced from serial number 101 up to machine serial number 4800, and
these machines were fitted with the HOWARD B.J. engine.
'Swinging type' handlebars and
a differential were introduced at the start
of the series II GEM, and later they were equiped with a reverse gear
operated by a lift up lever. Series II machines were produced from serial
number 4801 up to machine serial number 14784, and these machines
were fitted with the original HOWARD B.J. or
I II and IV machines overlapped. The basic machine
remained the same for both, only the engines were different.
Series I l l machines were produced from serial number 14785, and were
fitted with either the HOWARD B.J. or a J.A.P. 600cc engine. During
I II, the first series IV machines were phased in.
These machines were fitted with
a new HOWARD engine, the 180 Twin.
From machine serial number 38760 series l V machines only were produced,
but were fitted with an improved version of the twin engine-the
HOWARD 360 Twin -or alternatively a water cooled Sachs diesel engine.
Series IV machines were discontinued
at machine serial number 47066.
This is the current series of GEM, which was introduced
number 47067. Machines up to serial number 2541824 were fitted with
an up-rated version of the HOWARD 360 Twin engine, or the Sachs
diesel. From machine serial number 2541825,
been fitted in place of the twin, or from machine serial number 2571945,
an alternative diesel engine, the Hatz ES.780, has been used. An improved
version of the Hatz engine has been fitted from machine serial number
250A1021, and is designated the Hatz ES780U.
The super GEM is an up-rated version of the Series V model produced
specifically for contract work where greater strength and power are
required. Super GEM machines are fitted with either a Kohler K341 petrol
