GP7150A, GP7155A, GP7255A Repair Instructions

GP7150A, GP7155A, GP7255A REPAIR INSTRUCTIONS

TO CHECK VALVES

Lossen plugs (58), take out tension spring (57) and then remove the complete valve (51) with either a valve tool or an M16 hexagon screw. Remove valve adapter (56) and tension spring (57) with pull-out tool size 5. There is an O-ring (51G) under both the suction and the discharge valve each of which can be removed with a bent piece of wire.To disassemble valve hit the top of the valve plate (C) carefully with a bolt and press the valve seat (A) out of the spacer pipe (E). Check sealing surfaces and replace worn parts. Check O-rings and support rings.Tighten plugs (58) to 107 ft. lbs.

TO CHECK SEALS AND PLUNGER PIPE

Loosen nuts (49A) and remove pump head. Separate plunger connection (36A) from crosshead (25) by means of two open-end wrenches (size 22 and 27). Pull seal sleeves (39) out of their fittings in the crankcase.

Take seal case (38) out of seal sleeve (39). Examine plunger parts (36A-36D), seals (42,39A) and O-rings. When replacing plunger pipe (36B), tighten tension screws (36C) to 30 ft. lbs.

Replace worn parts; grease seals with Silicone before installing.

CAUTION: Don't loosen the 3 plunger connections (36A) before the valve casing has been removed otherwise the tension screw (36C) could hit against the spacer pipe (51E) when the pump is being turned. Seal life can be increased if the pretensioning allows for a little leakage. This assists lubrication and keeps the seals cool. It is therefore not necessary to replace seals before the leakage becomes too heavy and causes output and operating pressure to drop.

MOUNTING VALVE CASING

Check O-rings on seal case (38). Clean surfaces of seal sleeves in gear box and sealing surfaces of

valve casing. Push valve casing carefully on O-rings of seal case and centering studs (50A). Tighten nuts (49A) to 103 ft. lbs.

TO DISASSEMBLE GEAR

Take out plunger and seal sleeves as described above. Drain oil. After removing the circleclip ring (33B), lever out seal retainer (33) with a screw driver. Check seals (32, 32A, 33A) and surfaces of crosshead. Remove crankcase cover (4). Loosen inner hexagon screws on the connecting rods (24) and push con rod halves as far into the crosshead guide as possible.

Note: Connecting rods are marked for identification. Do not twist con rod halves. Con rod is to be reinstalled in the same position on shaft journals.Check surfaces of connecing rod and crankshaft (22) take out bearing cover to one side and push out crankshaft taking particular care that the conrod doesn't gt bent.

Note: Seal (32A) must always be installed so taht the seat up on the inside diameter faces the oil.

Reassemble in revers order: Regulate axial bearing clearance minimum 0.1mm, maximum 0.15-by

Preventative Maintenance Check-List & Recommended Spare Part List

Check	Daily	Weekly 50hr	Every	Every	Every
Check	Daily	Weekly 50hr	Every	Every	Every
			500 hr	1500 hr	3000hrs
Oil Level / Quality	X
Oil Leaks	X
Water Leaks	X
Belts, Pulley		X
Plumbing		X
		Recommended Spare	Part
Oil Change (p/n 01154)			X
X				X
Plunger Packing Kits(1 kit/Pump)				X
Plunger Packing Kits(1 kit/Pump)
See page 5 for kit list				X
Oil Seal Kit ( 1 kit/Pump				X
Oil Seal Kit ( 1 kit/Pump
See page 5 for kit list)					X
Valve Assembly Kit ( 1 kit/pump)					X
Valve Assembly Kit ( 1 kit/pump)
See page 5 for kit list
See page 5 for kit list

GP7255A, GP7155A, GP7150A specifications

The Giant GP7150A, GP7255A, and GP7155A are a series of advanced construction and agricultural machines known for their robust performance and innovative features. Each model brings a unique set of capabilities tailored to meet the diverse needs of industry professionals.

The GP7150A is designed as a versatile powerhouse, boasting an impressive engine that delivers high torque and horsepower, ensuring optimal productivity in demanding tasks. One of its main features is the advanced hydrostatic transmission that provides seamless speed control and direction changes, making it an ideal choice for those needing precision in tight spaces.

The GP7255A stands out with its enhanced lifting capacity, allowing operators to handle heavier loads efficiently. Its reinforced frame and hydraulics ensure maximum stability and performance under load. This model is equipped with state-of-the-art safety features, including an integrated monitoring system that alerts operators to potential issues, ultimately improving job site safety.

The GP7155A combines the features of both the GP7150A and GP7255A, offering a balanced solution for a variety of applications. Its engine is optimized for fuel efficiency, reducing operational costs while maximizing performance. Additionally, the GP7155A is equipped with a user-friendly interface that allows operators to access a range of machine settings easily, enhancing usability.

All three models are engineered with durability in mind. They feature high-strength materials and components designed to withstand the rigors of outdoor work, ensuring longevity and reliability. Furthermore, these machines incorporate advanced technologies such as GPS positioning and telematics, allowing for improved fleet management and easier maintenance.

In terms of comfort, the cabins of the GP7150A, GP7255A, and GP7155A are built with ergonomic designs that prioritize operator comfort. This includes adjustable seating, climate control systems, and improved visibility, which reduce fatigue and improve job performance throughout long work shifts.

In conclusion, Giant's GP7150A, GP7255A, and GP7155A models represent a significant advancement in construction and agricultural machinery. Their combination of power, efficiency, and operator comfort makes them suitable for a wide range of applications, ensuring that they remain competitive and effective choices for professionals in the field. This series is a testament to Giant’s commitment to innovation and excellence, catering to the evolving demands of the industry.