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. Gast’s
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. GAST’S 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, BUYER’S 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 GAST’S 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 customer’s responsibility.
CUSTOMER IS RESPONSIBLE FOR DETERMINING THE SUITABILITY OF GAST PRODUCTS FOR CUSTOMER’S 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.
WARRANTY
Replacing Leaf Valves
1. Separate head from valve plate. Remove then
discard O-ring and filter elements.
2. Remove slotted valve screw. Remove valve limiter,
leaf valves and valve retainer. Discard all valve
components except the valve plate. Do Not
damage the valve plate.
3. Clean pump head and valve plate using Gast
AH255B solvent. Air dry. Do No use
petroleum-based solvents for cleaning. Do Not
lubricate any parts.
4. Place valve plate so that the O-ring groove and
raised valve seat are facing down.
5. Using thumb and middle finger, gently flex valve to
find its natural inner curve. Place valve on valve
seat with the natural inner curve facing down. Valve
will only work correctly when the inner curve faces
down on the valve seat.
6. Place valve retainer with sharp side up and notch
away from valve.
7. Insert pan head screw through retainer, leaf valves
and valve plate.
8. Support screw while turning over valve plate
assembly. While holding screw in place, place leaf
valve (inner curve over raised valve seat) over
screw. Start valve limiter on threads of screw.
9. Align valve components and tighten screw to
12 to 13 in-lbs.
Reassembly
1. Place molded O-ring in valve plate O-ring groove.
Make sure O-ring doesn’t slip out of the groove.
2. Replace (2) filter elements in head with one element
inside each open port chamber.
3. Set head on top of valve plate so O-ring is properly
compressed and locating pin on head fits in locating
hole on valve plate.
4. Remove the cooling fan grill. Rotate fan by hand
until rod and diaphragm are at top dead center.
Align and reinstall shims on top of pump body.
5. Install head and valve assembly on pump. Reinstall
handle. Install the fasteners that hold the handle
and head assembly in place and hand tighten. In a
criss-cross torque pattern, run fasteners and nuts
to 100 in-lbs.
6. Reinstall gauges and plumbing.
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