Do Not replace the connecting rod or motor bearings.
Check that all external accessories such as relief valves
and gauges are attached to cover and are not damaged
before re-operating product.
If pump still does not produce proper vacuum or
pressure, send unit to a Gast Authorized Service Facility
for repair.
Gast finished products, when properly installed and operated under normal conditions of use, are warranted by Gast to
be free from defects in material and workmanship for a period of twelve (12) months from the date of purchase from
Gast or an authorized Gast Representative or Distributor. In order to obtain performance under this warranty, the buyer
must promptly (in no event later than thirty (30) days after discovery of the defect) give written notice of the defect to
Gast Manufacturing Incorporated, PO Box 97, Benton Harbor Michigan USA 49023-0097 or an authorized Service
Center (unless specifically agreed upon in writing signed by both parties or specified in writing as part of a Gast OEM
Quotation). Buyer is responsible for freight charges both to and from Gast in all cases.
This warranty does not apply to electric motors, electrical controls, and gasoline engines not supplied by Gast. Gastʼs
warranties also do not extend to any goods or parts which have been subjected to misuse, lack of maintenance,
neglect, damage by accident or transit damage.
THIS EXPRESS WARRANTY EXCLUDES ALL OTHER WARRANTIES OR REPRESENTATIONS EXPRESSED OR
IMPLIED BY ANY LITERATURE, DATA, OR PERSON. GASTʼS MAXIMUM LIABILITY UNDER THIS EXCLUSIVE
REMEDY SHALL NEVER EXCEED THE COST OF THE SUBJECT PRODUCT AND GAST RESERVES THE RIGHT,
AT ITS SOLE DISCRETION, TO REFUND THE PURCHASE PRICE IN LIEU OF REPAIR OR REPLACEMENT.
GAST WILL NOT BE RESPONSIBLE OR LIABLE FOR INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
however arising, including but not limited to those for use of any products, loss of time, inconvenience, lost profit, labor
charges, or other incidental or consequential damages with respect to persons, business, or property, whether as a
result of breach of warranty, negligence or otherwise. Notwithstanding any other provision of this warranty, BUYERʼS
REMEDY AGAINST GAST FOR GOODS SUPPLIED OR FOR NON-DELIVERED GOODS OR FAILURE TO FURNISH
GOODS, WHETHER OR NOT BASED ON NEGLIGENCE, STRICT LIABILITY OR BREACH OF EXPRESS OR
IMPLIED WARRANTY IS LIMITED SOLELY, AT GASTʼS OPTION, TO REPLACEMENT OF OR CURE OF SUCH
NONCONFORMING OR NON-DELIVERED GOODS OR RETURN OF THE PURCHASE PRICE FOR SUCH GOODS
AND IN NO EVENT SHALL EXCEED THE PRICE OR CHARGE FOR SUCH GOODS. GAST EXPRESSLY
DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE OR PURPOSE WITH
RESPECT TO THE GOODS SOLD. THERE ARE NO WARRANTIES WHICH EXTEND BEYOND THE DESCRIPTIONS
SET FORTH IN THIS WARRANTY, notwithstanding any knowledge of Gast regarding the use or uses intended to be
made of goods, proposed changes or additions to goods, or any assistance or suggestions that may have been made
by Gast personnel.
Unauthorized extensions of warranties by the customer shall remain the customerʼs responsibility.
CUSTOMER IS RESPONSIBLE FOR DETERMINING THE SUITABILITY OF GAST PRODUCTS FOR CUSTOMERʼS
USE OR RESALE, OR FOR INCORPORATING THEM INTO OBJECTS OR APPLICATIONS WHICH CUSTOMER
DESIGNS, ASSEMBLES, CONSTRUCTS OR MANUFACTURES.
This warranty can be modified only by authorized Gast personnel by signing a specific, written description of any
modifications.
5
1. Put on eye protection.
2. Disconnect electrical power to pump.
3. Disconnect air supply and vent all air lines to
release pressure or vacuum.
4. Remove the socket cap screws from the head of the
pump. Remove the head and valveplate from the
pump. (Caution: Do not lose the shim washers
that are at each corner between the valveplate and
body of the unit. Upon reistallation, these shims
must be put back in the same position they were
taken from to maintain proper had clearances.
Replacing Diaphragm
1. Remove the two Phillips-head screws then
the retainer plate and diaphragm.
2. Install the new diaphragm in any position onto
the connecting rod.
3. Replace the retainer plate and attach with two
screws. Torque the screws to 30 in. lbs.
Replacing Inlet and Outlet Valves
1. Remove the slotted machine screw that holds
each valve in place.
2. Clean the stainless steel valves with water.
Valves are interchangeable.
3. Replace both valves or install new valves making
sure that the valves completely cover the raised
valve seat. Check that the notch marked on the
inlet valve is in the lower right hand corner
towards the inlet of the air chamber.
4. Replace the head on the pump. Torque the
socket cap screws to 90-100 in. lbs.
Gast will NOT guarantee field-rebuilt product
performance. For performance guarantee, the product
must be returned to a Gast Authorized Service Facility.
Service Kit contents vary. Most contain gaskets and
filter parts.
WARRANTY
